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<?php |
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namespace Upress\EzCache\FileOptimizer; |
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|
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use MatthiasMullie\Minify\CSS; |
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use Upress\EzCache\Cache; |
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|
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class CssMinifier extends BaseFileOptimizer { |
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static $FILE_TYPE = 'css'; |
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|
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protected $settings; |
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protected $minify_base_path; |
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protected $minify_base_url; |
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|
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function __construct( $cache_dir, $cache_url ) { |
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$this->minify_base_path = $cache_dir; |
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$this->minify_base_url = $cache_url; |
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} |
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|
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/** |
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* Minifies CSS files |
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* |
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* @param string $html HTML content. |
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* |
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* @return string |
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*/ |
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public function optimize( $html ) { |
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$styles = $this->find( '<link\s+([^>]+[\s"\'])?href\s*=\s*[\'"]\s*?([^\'"]+\.css(?:\?[^\'"]*)?)\s*?[\'"]([^>]+)?\/?>', $html ); |
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|
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if ( ! $styles ) { |
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return $html; |
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} |
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|
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foreach ( $styles as $style ) { |
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if ( preg_match( '/(?:-|\.)min.css/iU', $style[2] ) ) { |
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continue; |
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} |
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|
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if ( $this->is_external_file( $style[2] ) ) { |
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continue; |
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} |
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|
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if ( $this->is_minify_excluded_file( $style ) ) { |
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continue; |
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} |
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|
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$minify_url = $this->replace_url( $style[2] ); |
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|
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if ( ! $minify_url ) { |
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continue; |
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} |
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|
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$replace_style = str_replace( $style[2], $minify_url, $style[0] ); |
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$replace_style = str_replace( '<link', '<link data-minify="1"', $replace_style ); |
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$html = str_replace( $style[0], $replace_style, $html ); |
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} |
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|
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return $html; |
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} |
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|
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/** |
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* Creates the minify URL if the minification is successful |
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* |
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* @param string $url Original file URL. |
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|
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* @return string|bool The minify URL if successful, false otherwise |
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*/ |
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private function replace_url( $url ) { |
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if ( empty( $url ) ) { |
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return false; |
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} |
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|
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$unique_id = md5( $url ); |
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$filename = preg_replace( '/\.(css)$/', '-' . $unique_id . '.css', ltrim( Cache::realpath( $this->get_url_component( $url, PHP_URL_PATH ) ), '/' ) ); |
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|
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$minified_file = $this->minify_base_path . $filename; |
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$minify_url = $this->minify_base_url . $filename; |
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|
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if ( file_exists( $minified_file ) ) { |
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touch( $minified_file ); |
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return $minify_url; |
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} |
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|
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$file_path = $this->get_file_path( $url ); |
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|
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if ( ! $file_path ) { |
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return false; |
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} |
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|
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$minified_content = $this->minify( $file_path ); |
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|
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if ( ! $minified_content ) { |
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return false; |
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} |
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|
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wp_mkdir_p( dirname( $minified_file ) ); |
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$save_minify_file = file_put_contents( $minified_file, $minified_content ); |
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|
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if ( ! $save_minify_file ) { |
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return false; |
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} |
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|
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return $minify_url; |
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} |
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|
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/** |
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* Minifies the content |
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* |
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* @param string|array $file File to minify. |
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* @return string|bool Minified content, false if empty |
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*/ |
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protected function minify( $file ) { |
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$file_content = file_get_contents( $file ); |
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|
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if ( ! $file_content ) { |
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return false; |
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} |
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|
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$file_content = $this->rewrite_paths( $file, $file_content ); |
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$minifier = new CSS( $file_content ); |
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$minified_content = $minifier->minify(); |
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|
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if ( empty( $minified_content ) ) { |
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return false; |
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} |
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|
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return $minified_content; |
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} |
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} |
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|
