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<?php
namespace WP_Rocket\Engine\Media\Lazyload\CSS\Front;
use WP_Rocket\Engine\Optimization\RegexTrait;
use WP_Rocket\Engine\Optimization\UrlTrait;
class Extractor {
use RegexTrait;
use UrlTrait;
/**
* Comment mapping.
*
* @var array
*/
protected $comments_mapping = [];
/**
* Extract background images from CSS.
*
* @param string $content CSS content.
* @param string $file_url File we are extracting css from.
* @return array
*/
public function extract( string $content, string $file_url = '' ): array {
$this->comments_mapping = [];
$comment_regex = '#/\*[^*]*\*+([^/][^*]*\*+)*/#';
$content = preg_replace_callback(
$comment_regex,
function ( $matches ) {
$id = '/*' . uniqid( 'bg_css_comment' ) . '*/';
$this->comments_mapping[ $id ] = $matches[0];
return $id;
},
$content
);
$background_regex = '\s?{[^{}]*background\s*:(?<property>[^;}]*)[^}]*}';
$background_image_regex = '(?:background-image)\s*:(?<property>[^;}]*)[^}]*}';
$content_reversed = strrev( $content );
$format_content = $this->reformat_css( $content );
/**
* Lazyload background property regex.
*
* @param string $regex Lazyload background property regex.
*/
$background_regex = $this->apply_string_filter( 'lazyload_css_extract_bg_property_regex', $background_regex );
/**
* Lazyload background property regex.
*
* @param string $regex Lazyload background property regex.
*/
$background_image_regex = $this->apply_string_filter( 'lazyload_css_extract_bg_img_property_regex', $background_image_regex );
$background_matches = $this->find( $background_regex, $content, 'mi', PREG_OFFSET_CAPTURE );
$background_image_matches = $this->find( $background_image_regex, $content, 'mi', PREG_OFFSET_CAPTURE );
$background_property_matches = $background_matches['property'] ?? [];
$background_image_property_matches = $background_image_matches['property'] ?? [];
$matches = array_merge( $background_property_matches, $background_image_property_matches );
if ( empty( $matches ) ) {
return [];
}
$results = [];
$arr_selector = [];
foreach ( $matches as $match ) {
$original_offset = $match[1];
$adjusted_offset = strlen( $content ) - $original_offset - strlen( $match[0] );
// Reverse the selector regex.
$reversed_selector_regex = '/dnuorgkcab[^{}]*{\s?(?<reversed_selector>(?:[ \-,:\w\.\(\)\n\r\$\|^>[*"\'=~\]#]|(?:\][^\]]+\[))+)/mi';
// Execute preg_match to find reversed selector.
preg_match( $reversed_selector_regex, $content_reversed, $reversed_selector_matches, PREG_OFFSET_CAPTURE, $adjusted_offset );
if ( empty( $reversed_selector_matches ) ) {
continue;
}
// Extract reversed selector and reverse it back.
$reversed_selector = $reversed_selector_matches['reversed_selector'][0];
$selector = trim( strrev( $reversed_selector ) );
$property = trim( $match[0] );
$block_regex_selector = $selector;
$escaped_block_selector = preg_quote( $block_regex_selector, '/' );
preg_match_all( "/^\s*$escaped_block_selector\s*{(.*?)}/ms", $format_content, $block_matches );
$block_index = 0;
$default_index = 0;
/**
* If block matches is empty then try to use the second regex pattern.
* The first pattern will match the selector literally but sometimes fails to match
* selector within an internal style, the second make sure we capture it.
* e.g. style>.selector_name within <style>.selector_name will not be capture
* with the first pattern.
*/
if ( empty( $block_matches[ $default_index ] ) ) {
preg_match_all( "/\s*$escaped_block_selector\s*{(.*?)}/ms", $format_content, $block_matches );
}
$urls = $this->extract_urls( $property, $file_url );
if ( in_array( $selector, $arr_selector, true ) ) {
$indexes = array_keys( $arr_selector, trim( $selector ), true );
$block_index = count( $indexes );
}
$arr_selector[] = $selector;
if ( empty( $block_matches ) ) {
continue;
}
$block = trim( $block_matches[ $default_index ][ $default_index ] );
if ( ! empty( $block_matches[ $default_index ][ $block_index ] ) ) {
$block = trim( $block_matches[ $default_index ][ $block_index ] );
}
foreach ( $this->comments_mapping as $id => $comment ) {
$block = str_replace( $id, $comment, $block );
}
foreach ( $urls as $url ) {
$results[ $selector ][] = [
'selector' => $selector,
'url' => $url['url'],
'original' => $url['original'],
'block' => $block,
];
}
}
return $results;
}
/**
* Extract URLS from a CSS property.
*
* @param string $content Content from the CSS property.
* @param string $file_url URL of the css file.
* @return array
*/
protected function extract_urls( string $content, string $file_url = '' ): array {
/**
* Lazyload URL regex.
*
* @param string $regex Lazyload URL regex.
*/
$regex = $this->apply_string_filter( 'lazyload_css_extract_url_regex', '(?<tag>url\([\'"]?(?<url>[^\)]*)[\'"]?\))' );
$matches = $this->find( $regex, $content, 'mi' );
$output = [];
/**
* Lazyload ignored URLs.
*
* @param string[] $urls Ignored URLs.
*/
$ignored_urls = (array) apply_filters( 'rocket_lazyload_css_ignored_urls', [] );
foreach ( $matches as $match ) {
$url = $match['url'] ?: '';
$url = str_replace( '"', '', $url );
$url = str_replace( "'", '', $url );
$url = trim( $url );
$url = $this->make_url_complete( $url, $file_url );
if ( ! key_exists( 'tag', $match ) || ! key_exists( 'url', $match ) || ! $url || $this->is_url_ignored( $url, $ignored_urls ) ) {
continue;
}
if ( ! $this->is_url_external( $url ) && ! $this->is_relative( $url ) ) {
$url = $this->apply_string_filter( 'css_url', $url );
}
$original_url = trim( $match['tag'], ' ,' );
$output[] = [
'url' => $url,
'original' => $original_url,
];
}
return $output;
}
/**
* Reformat css most especially minified css to make sure each rule are on
* a separate line.
*
* @param string $css_content The css content to be formatted.
*
* @return string
*/
protected function reformat_css( string $css_content ): string {
$matches = $this->find( '(.*?\{.*?\})', $css_content, 's', PREG_PATTERN_ORDER );
$formatted_css = '';
if ( empty( $matches ) ) {
return $css_content;
}
foreach ( $matches[0] as $class_block ) {
$formatted_css .= $class_block . "\n";
}
return $formatted_css;
}
/**
* Apply a string filter.
*
* @param string $name Name from the filter.
* @param string $value Value to pass to the filter that will be returned.
* @param array ...$args Additional values.
* @return string
*/
protected function apply_string_filter( string $name, string $value, ...$args ) {
$output = apply_filters( 'rocket_' . $name, $value, ...$args );
if ( ! is_string( $output ) ) {
return $value;
}
return $output;
}
/**
* Check if the URLs is ignored.
*
* @param string $url URL to check.
* @param array $ignored_urls List of ignored URLs.
*
* @return bool
*/
protected function is_url_ignored( string $url, array $ignored_urls ): bool {
foreach ( $ignored_urls as $ignored_url ) {
if ( strpos( $url, $ignored_url ) !== false ) {
return true;
}
}
return false;
}
/**
* Complete the URL if necessary.
*
* @param string $url URL to complete.
* @param string $file_url URL of the CSS File.
*
* @return string
*/
protected function make_url_complete( string $url, string $file_url ): string {
$host = wp_parse_url( $url, PHP_URL_HOST );
if (
$host
||
( $this->is_relative( $url ) && ! empty( $file_url ) )
) {
return $this->transform_relative_to_absolute( $url, $file_url );
}
return rocket_get_home_url() . '/' . trim( $url, '/ ' );
}
/**
* Transform a relative URL to an absolute URL based on the base URL.
*
* @param string $rel Relative URL to transform.
* @param string $base Base URL.
*
* @return string
*/
protected function transform_relative_to_absolute( string $rel, string $base = '' ): string {
if ( ! is_null( wp_parse_url( $rel, PHP_URL_SCHEME ) ) ) {
return $rel;
}
if ( '#' === $rel[0] || '?' === $rel[0] ) {
return $base . $rel;
}
$base_url_parts = wp_parse_url( $base );
$path = ! empty( $base_url_parts['path'] ) ? $base_url_parts['path'] : '/';
$path = preg_replace( '#/[^/]*$#', '', $path );
if ( '/' === $rel[0] ) {
$path = '';
}
$abs = "$path/$rel";
$re = [ '#(/\.?/)#', '#/(?!\.\.)[^/]+/\.\./#' ];
$dots_count = substr_count( $rel, '..' );
foreach ( range( 1, $dots_count ) as $n ) {
$abs_before = $abs;
$abs = preg_replace( $re, '/', $abs, -1, $n );
if ( $abs_before === $abs ) {
break;
}
}
return trailingslashit( rocket_get_home_url() ) . ltrim( $abs, '/' );
}
/**
* Check if the URL is external.
*
* @param string $url URL to check.
*
* @return bool
*/
protected function is_url_external( string $url ): bool {
$host = wp_parse_url( $url, PHP_URL_HOST );
if ( ! $host ) {
return false;
}
$home_host = wp_parse_url( rocket_get_home_url(), PHP_URL_HOST );
return $host !== $home_host;
}
}