get_styles( $html ); if ( empty( $styles ) ) { return $html; } foreach ( $styles as $style ) { if ( $this->is_minify_excluded_file( $style ) ) { Logger::debug( 'Style is excluded.', [ 'css minification process', 'tag' => $style[0], ] ); continue; } $integrity_validated = $this->local_cache->validate_integrity( $style ); if ( false === $integrity_validated ) { Logger::debug( 'Style integrity attribute not valid.', [ 'css minification process', 'tag' => $style[0], ] ); continue; } $style['final'] = $integrity_validated; $minify_url = $this->replace_url( strtok( $style['url'], '?' ) ); if ( ! $minify_url ) { Logger::error( 'Style minification failed.', [ 'css minification process', 'tag' => $style[0], ] ); continue; } $html = $this->replace_style( $style, $minify_url, $html ); } return $html; } /** * Get all style tags from HTML. * * @param string $html HTML content. * * @return array Array with style tags, empty array if no style tags found. */ protected function get_styles( $html ) { $html_nocomments = $this->hide_comments( $html ); $styles = $this->find( ']+[\s"\'])?href\s*=\s*[\'"]\s*?(?[^\'"]+\.css(?:\?[^\'"]*)?)\s*?[\'"]([^>]+)?\/?>', $html_nocomments ); if ( ! $styles ) { Logger::debug( 'No `` tags found.', [ 'css minification process' ] ); return []; } Logger::debug( 'Found ' . count( $styles ) . ' `` tags.', [ 'css minification process', 'tags' => $styles, ] ); return $styles; } /** * Creates the minify URL if the minification is successful * * @since 2.11 * * @param string $url Original file URL. * * @return string|bool The minify URL if successful, false otherwise */ private function replace_url( $url ) { if ( empty( $url ) ) { return false; } // This filter is documented in /inc/classes/optimization/class-abstract-optimization.php. $url = apply_filters( 'rocket_asset_url', $url, $this->get_zones() ); $parsed_url = wp_parse_url( $url ); if ( empty( $parsed_url['path'] ) ) { return false; } if ( ! empty( $parsed_url['host'] ) ) { $url = rocket_add_url_protocol( $url ); } $filename = ltrim( rocket_realpath( $parsed_url['path'] ), '/' ); $minified_file = rawurldecode( $this->minify_base_path . $filename ); if ( rocket_direct_filesystem()->exists( $minified_file ) ) { Logger::debug( 'Minified CSS file already exists.', [ 'css minification process', 'path' => $minified_file, ] ); return $this->get_full_minified_url( $minified_file, $this->get_minify_url( $filename, $url ) ); } $external_url = $this->is_external_file( $url ); $file_path = $external_url ? $this->local_cache->get_filepath( $url ) : $this->get_file_path( $url ); if ( empty( $file_path ) ) { Logger::error( 'Couldn’t get the file path from the URL.', [ 'css minification process', 'url' => $url, ] ); return false; } $file_content = $external_url ? $this->local_cache->get_content( $url ) : $this->get_file_content( $file_path ); if ( ! $file_content ) { Logger::error( 'No file content.', [ 'css minification process', 'path' => $file_path, ] ); return false; } $minified_content = $external_url ? $this->minify( $url, $minified_file, $file_content ) : $this->minify( $file_path, $minified_file, $file_content ); if ( empty( $minified_content ) ) { return false; } $minified_content = $this->font_display_swap( $url, $minified_file, $minified_content ); if ( empty( $minified_content ) ) { return false; } $save_minify_file = $this->save_minify_file( $minified_file, $minified_content ); if ( ! $save_minify_file ) { return false; } return $this->get_full_minified_url( $minified_file, $this->get_minify_url( $filename, $url ) ); } /** * Replace old style tag with the minified tag. * * @param array $style Style matched data. * @param string $minify_url Minified URL. * @param string $html HTML content. * * @return string */ protected function replace_style( $style, $minify_url, $html ) { $replace_style = str_replace( $style['url'], $minify_url, $style['final'] ); $replace_style = str_replace( ' $minify_url, ] ); return $html; } /** * Save minified CSS file. * * @since 3.7 * * @param string $minified_file Minified file path. * @param string $minified_content Minified HTML content. * * @return bool */ protected function save_minify_file( $minified_file, $minified_content ) { $save_minify_file = $this->write_file( $minified_content, $minified_file ); if ( ! $save_minify_file ) { Logger::error( 'Minified CSS file could not be created.', [ 'css minification process', 'path' => $minified_file, ] ); return false; } Logger::debug( 'Minified CSS file successfully created.', [ 'css minification process', 'path' => $minified_file, ] ); return true; } /** * Applies font display swap if the file contains @font-face. * * @since 3.7 * * @param string $url File Url. * @param string $minified_file Minified file path. * @param string $content CSS file content. * * @return string */ protected function font_display_swap( $url, $minified_file, $content ) { if ( preg_match( '/(?:-|\.)min.css/iU', $url ) && false === stripos( $content, '@font-face' ) ) { Logger::error( 'Do not apply font display swap on min.css files without font-face.', [ 'css minification process', 'path' => $minified_file, ] ); if ( ! $this->is_external_file( $url ) ) { return ''; } return $content; } return $this->apply_font_display_swap( $content ); } /** * Minifies the content * * @since 2.11 * * @param string $file_path Source filepath. * @param string $minified_file Target filepath. * @param string $file_content Content to minify. * * @return string */ protected function minify( $file_path, $minified_file, $file_content ) { $file_content = $this->rewrite_paths( $file_path, $minified_file, $file_content ); $minifier = $this->get_minifier( $file_content ); $minified_content = $minifier->minify(); if ( empty( $minified_content ) ) { Logger::error( 'No minified content.', [ 'css minification process', 'path' => $minified_file, ] ); return ''; } return $minified_content; } /** * Returns a new minifier instance * * @since 3.1 * * @param string $file_content Content to minify. * * @return Minifier\CSS */ protected function get_minifier( $file_content ) { return new Minifier\CSS( $file_content ); } }