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<?php |
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namespace Upress\EzCache\FileOptimizer; |
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|
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/** |
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* Combine Google Fonts |
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* |
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* @since 3.1 |
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* @author Remy Perona |
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*/ |
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class CombineGoogleFonts extends BaseFileOptimizer { |
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protected $fonts; |
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protected $subsets; |
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|
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public function __construct() { |
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$this->fonts = []; |
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$this->subsets = []; |
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} |
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|
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/** |
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* Combines multiple Google Fonts links 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( $html ) { |
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$fonts = $this->find( '<link(?:\s+(?:(?!href\s*=\s*)[^>])+)?(?:\s+href\s*=\s*([\'"])((?:https?:)?\/\/fonts\.googleapis\.com\/css(?:(?!\1).)+)\1)(?:\s+[^>]*)?>', $html ); |
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|
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if ( ! $fonts ) { |
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return $html; |
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} |
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|
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$this->parse( $fonts ); |
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|
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if ( empty( $this->fonts ) ) { |
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return $html; |
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} |
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|
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$html = str_replace( '</title>', '</title>' . $this->get_combine_tag(), $html ); |
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|
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foreach ( $fonts as $font ) { |
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$html = str_replace( $font[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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* Finds links to Google fonts |
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* |
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* @param string $pattern Pattern to search for. |
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* @param string $html HTML content. |
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* |
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* @return bool|array |
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*/ |
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protected function find( $pattern, $html ) { |
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preg_match_all( '/' . $pattern . '/uUmsi', $html, $matches, PREG_SET_ORDER ); |
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|
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if ( count( $matches ) <= 1 ) { |
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return false; |
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} |
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|
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return $matches; |
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} |
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|
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/** |
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* Parses found matches to extract fonts and subsets |
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* |
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* @param array $matches Found matches for the pattern. |
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*/ |
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protected function parse( $matches ) { |
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foreach ( $matches as $match ) { |
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$query = $this->get_url_component( $match[2], PHP_URL_QUERY ); |
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|
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if ( ! isset( $query ) ) { |
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return; |
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} |
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|
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$query = html_entity_decode( $query ); |
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$font = wp_parse_args( $query ); |
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|
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// Add font to the collection. |
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$this->fonts[] = rawurlencode( htmlentities( $font['family'] ) ); |
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|
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// Add subset to collection. |
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$this->subsets[] = isset( $font['subset'] ) ? rawurlencode( htmlentities( $font['subset'] ) ) : ''; |
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} |
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|
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// Concatenate fonts tag. |
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$this->subsets = ( $this->subsets ) ? '&subset=' . implode( ',', array_filter( array_unique( $this->subsets ) ) ) : ''; |
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$this->fonts = implode( '|', array_filter( array_unique( $this->fonts ) ) ); |
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$this->fonts = str_replace( '|', '%7C', $this->fonts ); |
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} |
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|
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/** |
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* Returns the combined Google fonts link tag |
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* |
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* @return string |
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*/ |
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protected function get_combine_tag() { |
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return '<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=' . $this->fonts . $this->subsets . '" />'; |
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} |
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} |
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