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<?php
namespace WP_Rocket\Engine\Optimization\Minify\CSS;
use WP_Rocket\Dependencies\Minify\CSS as MinifyCSS;
use WP_Rocket\Engine\Optimization\CSSTrait;
use WP_Rocket\Engine\Optimization\Minify\ProcessorInterface;
use WP_Rocket\Logger\Logger;
/**
* Minify & Combine CSS files
*
* @since 3.1
*/
class Combine extends AbstractCSSOptimization implements ProcessorInterface {
use CSSTrait;
/**
* Array of styles
*
* @var array
*/
private $styles = [];
/**
* Combined CSS filename
*
* @var string
*/
private $filename;
/**
* Minifies and combines all CSS files into one
*
* @since 3.1
*
* @param string $html HTML content.
* @return string
*/
public function optimize( $html ) {
Logger::info( 'CSS COMBINE PROCESS STARTED.', [ 'css combine process' ] );
$html_nocomments = $this->hide_comments( $html );
$styles = $this->find( '<link\s+([^>]+[\s"\'])?href\s*=\s*[\'"]\s*?(?<url>[^\'"]+\.css(?:\?[^\'"]*)?)\s*?[\'"]([^>]+)?\/?>', $html_nocomments );
if ( ! $styles ) {
Logger::debug( 'No `<link>` tags found.', [ 'css combine process' ] );
return $html;
}
Logger::debug(
'Found ' . count( $styles ) . ' `<link>` tag(s).',
[
'css combine process',
'tags' => $styles,
]
);
$styles = $this->parse( $styles );
if ( empty( $styles ) ) {
Logger::debug( 'No `<link>` tags to optimize.', [ 'css combine process' ] );
return $html;
}
Logger::debug(
count( $styles ) . ' `<link>` tag(s) remaining.',
[
'css combine process',
'tags' => $styles,
]
);
if ( ! $this->combine() ) {
Logger::error( 'CSS combine process failed.', [ 'css combine process' ] );
return $html;
}
return $this->insert_combined_css( $html );
}
/**
* Parses all found styles tag to keep only the ones to combine
*
* @since 3.7
*
* @param array $styles Array of matched styles.
* @return array
*/
private function parse( array $styles ) {
foreach ( $styles as $key => $style ) {
if ( $this->is_combine_excluded_media( $style[0] ) ) {
Logger::debug(
'Style is excluded due to media attribute.',
[
'css combine process',
'tag' => $style[0],
]
);
continue;
}
if ( $this->is_external_file( $style['url'] ) ) {
if ( $this->is_excluded_external( $style['url'] ) ) {
unset( $styles[ $key ] );
continue;
}
$this->styles[ $style['url'] ] = [
'type' => 'external',
'tag' => $style[0],
'url' => rocket_add_url_protocol( strtok( $style['url'], '?' ) ),
];
continue;
}
if ( $this->is_minify_excluded_file( $style ) ) {
Logger::debug(
'Style is excluded.',
[
'css combine process',
'tag' => $style[0],
]
);
unset( $styles[ $key ] );
continue;
}
$this->styles[ $style['url'] ] = [
'type' => 'internal',
'tag' => $style[0],
'url' => strtok( $style['url'], '?' ),
];
}
return $styles;
}
/**
* Checks if the provided external URL is excluded from combine
*
* @since 3.7
*
* @param array $url External URL to check.
* @return boolean
*/
private function is_excluded_external( $url ) {
foreach ( $this->get_excluded_externals() as $excluded ) {
if ( false !== strpos( $url, $excluded ) ) {
Logger::debug(
'Style is external.',
[
'css combine process',
'url' => $url,
]
);
return true;
}
}
return false;
}
/**
* Gets external URLs excluded from combine
*
* @since 3.7
*
* @return array
*/
private function get_excluded_externals() {
/**
* Filters CSS external URLs to exclude from the combine process
*
* @since 3.7
*
* @param array $pattern Patterns to match.
*/
$excluded_externals = (array) apply_filters( 'rocket_combine_css_excluded_external', [] );
return array_merge( $excluded_externals, $this->options->get( 'exclude_css', [] ) );
}
/**
* Combine the CSS content into one file and save it
*
* @since 3.1
*
* @return bool True if successful, false otherwise
*/
protected function combine() {
if ( empty( $this->styles ) ) {
return false;
}
$file_hash = implode( ',', array_column( $this->styles, 'url' ) );
$this->filename = md5( $file_hash . $this->minify_key ) . '.css';
$combined_file = $this->minify_base_path . $this->filename;
if ( rocket_direct_filesystem()->exists( $combined_file ) ) {
Logger::debug(
'Combined CSS file already exists.',
[
'css combine process',
'path' => $combined_file,
]
);
return true;
}
$combined_content = $this->get_content( $combined_file );
$combined_content = $this->apply_font_display_swap( $combined_content );
if ( empty( $combined_content ) ) {
Logger::error(
'No combined content.',
[
'css combine process',
'path' => $combined_file,
]
);
return false;
}
if ( ! $this->write_file( $combined_content, $combined_file ) ) {
Logger::error(
'Combined CSS file could not be created.',
[
'css combine process',
'path' => $combined_file,
]
);
return false;
}
Logger::debug(
'Combined CSS file successfully created.',
[
'css combine process',
'path' => $combined_file,
]
);
return true;
}
/**
* Insert the combined CSS file and remove the original CSS tags
*
* The combined CSS file is added after the closing </title> tag, and the replacement occurs only once. The original CSS tags are then removed from the HTML.
*
* @since 3.3.3
*
* @param string $html HTML content.
* @return string
*/
protected function insert_combined_css( $html ) {
foreach ( $this->styles as $style ) {
$html = str_replace( $style['tag'], '', $html );
}
$minify_url = $this->get_minify_url( $this->filename );
Logger::info(
'Combined CSS file successfully added.',
[
'css combine process',
'url' => $minify_url,
]
);
// phpcs:ignore WordPress.WP.EnqueuedResources.NonEnqueuedStylesheet
return preg_replace( '/<\/title>/i', '$0<link rel="stylesheet" href="' . esc_url( $minify_url ) . '" media="all" data-minify="1" />', $html, 1 );
}
/**
* Gathers the content from all styles to combine & minify it if needed
*
* @since 3.7
*
* @param string $combined_file Absolute path to the combined file.
* @return string
*/
private function get_content( $combined_file ) {
$minifier = new MinifyCSS();
foreach ( $this->styles as $key => $style ) {
if ( 'internal' === $style['type'] ) {
$filepath = $this->get_file_path( $style['url'] );
if ( ! $filepath ) {
unset( $this->styles[ $key ] );
continue;
}
$file_content = $this->get_file_content( $filepath );
$file_content = $this->rewrite_paths( $filepath, $combined_file, $file_content );
} elseif ( 'external' === $style['type'] ) {
$file_content = $this->local_cache->get_content( $style['url'] );
$file_content = $this->rewrite_paths( $style['url'], $combined_file, $file_content );
}
if ( empty( $file_content ) ) {
unset( $this->styles[ $key ] );
continue;
}
$minifier->add( $file_content );
}
$content = $minifier->minify();
if ( empty( $content ) ) {
Logger::debug( 'No CSS content.', [ 'css combine process' ] );
}
return $content;
}
/**
* Check if media query is valid to be excluded from combine or not.
*
* @since 3.8
*
* @param string $tag Stylesheet HTML tag.
* @return bool Ture if it's excluded else false.
*/
private function is_combine_excluded_media( $tag ) {
return (
false !== strpos( $tag, 'media=' )
&&
! preg_match( '/media=["\'](?:\s*|[^"\']*?\b(?:\s*?,\s*?)?(all|screen)(?:\s*?,\s*?[^"\']*)?)["\']/i', $tag )
);
}
}
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