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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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|
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class CssCombiner extends BaseFileOptimizer { |
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static $FILE_TYPE = 'css'; |
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|
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protected $minifier; |
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protected $minify_base_path; |
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protected $minify_base_url; |
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|
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|
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function __construct( $cache_dir, $cache_url ) { |
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$this->minifier = new CSS(); |
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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 and combines all CSS files into one |
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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 $html; |
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} |
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|
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$files = []; |
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$styles = array_map( function( $style ) use ( &$files ) { |
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if ( $this->is_external_file( $style[2] ) ) { |
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return ''; |
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} |
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|
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if ( $this->is_minify_excluded_file( $style ) ) { |
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return ''; |
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} |
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|
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$style_filepath = $this->get_file_path( $style[2] ); |
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|
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if ( ! $style_filepath ) { |
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return ''; |
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} |
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|
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$files[] = $style_filepath; |
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|
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return $style; |
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}, $styles ); |
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|
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if ( empty( $styles ) ) { |
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return $html; |
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} |
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|
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$minify_url = $this->combine( $files ); |
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|
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if ( ! $minify_url ) { |
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return $html; |
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} |
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|
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$html = str_replace( '</title>', '</title><link rel="stylesheet" href="' . $minify_url . '" data-minify="1" />', $html ); |
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|
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$styles = array_filter( $styles ); |
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foreach ( $styles as $style ) { |
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$html = str_replace( $style[0], '', $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 array $files Files to minify. |
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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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protected function combine( $files ) { |
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if ( empty( $files ) ) { |
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return false; |
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} |
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|
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$file_hash = implode( ',', $files ); |
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$filename = md5( $file_hash ) . '.css'; |
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|
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$minified_file = $this->minify_base_path . $filename; |
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|
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if ( file_exists( $minified_file ) ) { |
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touch( $minified_file ); |
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} else { |
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$minified_content = $this->minify( $files ); |
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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( $minified_file ) ); |
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$minify_filepath = file_put_contents( $minified_file, $minified_content ); |
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|
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if ( ! $minify_filepath ) { |
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return false; |
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} |
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} |
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|
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return $this->minify_base_url . $filename; |
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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 $files Files 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( $files ) { |
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foreach ( $files as $file ) { |
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$file_content = file_get_contents( $file ); |
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$file_content = $this->rewrite_paths( $file, $file_content ); |
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|
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$this->minifier->add( $file_content ); |
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} |
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|
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$minified_content = $this->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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