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<?php |
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if (!defined('ABSPATH')) die('No direct access allowed'); |
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|
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class WP_Optimize_Minify_Fonts { |
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|
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private static $fonts = array(); |
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|
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private static $subsets = array(); |
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|
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/** |
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* Get a list of Google fonts |
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* |
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* @return Array |
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*/ |
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public static function get_google_fonts() { |
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// https://www.googleapis.com/webfonts/v1/webfonts?sort=alpha |
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$google_fonts_file = WPO_PLUGIN_MAIN_PATH.'google-fonts.json'; |
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if (is_file($google_fonts_file) && is_readable($google_fonts_file)) { |
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return json_decode(file_get_contents($google_fonts_file), true); |
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} |
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return array(); |
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} |
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|
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/** |
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* Check if the google font exist or not |
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* |
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* @param string $font |
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* @return boolean |
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*/ |
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public static function concatenate_google_fonts_allowed($font) { |
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$gfonts_whitelist = self::get_google_fonts(); |
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|
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// normalize |
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$font = str_ireplace('+', ' ', strtolower($font)); |
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|
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return in_array($font, $gfonts_whitelist); |
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} |
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|
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/** |
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* Concatenates Google Fonts tags (http://fonts.googleapis.com/css?...) |
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* |
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* @param array $gfonts_array |
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* @return string|boolean |
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*/ |
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public static function concatenate_google_fonts($gfonts_array) { |
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// Loop through fonts array |
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foreach ($gfonts_array as $font) { |
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self::parse_font_url($font); |
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} |
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self::convert_v1_font_specs_to_v2(); |
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$merge = self::build(); |
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$config = wp_optimize_minify_config(); |
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/** |
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* Filters wether to add display=swap to Google fonts urls |
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* |
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* @param boolean $display - Default to true |
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*/ |
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if (apply_filters('wpo_minify_gfont_display_swap', $config->get('enable_display_swap'))) { |
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/** |
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* Filters the value of the display parameter. |
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* |
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* @param string $display_value - Default to 'swap'. https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display |
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*/ |
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$merge.= '&display='.apply_filters('wpo_minify_gfont_display_type', 'swap'); |
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} |
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|
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if (!empty($merge)) return 'https://fonts.googleapis.com/css2?' . $merge; |
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|
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return false; |
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} |
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|
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/** |
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* Parses font url based on whether it is API version 1 or 2 |
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*/ |
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private static function parse_font_url($font) { |
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if (false !== strpos($font, 'css?')) { |
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self::parse_font_api1_url($font); |
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} else { |
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self::parse_font_api2_url($font); |
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} |
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} |
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|
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/** |
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* Parses google font api version 1 url |
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*/ |
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private static function parse_font_api1_url($font) { |
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parse_str(parse_url(rtrim($font, '|'), PHP_URL_QUERY), $font_elements); |
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// Process each font family |
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foreach (explode('|', $font_elements['family']) as $font_family) { |
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// Separate font and sizes |
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$font_family = explode(':', $font_family); |
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// if the family wasn't added yet |
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if (!in_array($font_family[0], array_keys(self::$fonts))) { |
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self::$fonts[$font_family[0]]['specs'] = isset($font_family[1]) ? explode(',', rtrim($font_family[1], ',')) : array(); |
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} else { |
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// if the family was already added, and this new one has weights, merge with previous |
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if (isset($font_family[1])) { |
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if (isset(self::$fonts[$font_family[0]]['version']) && 'V2' == self::$fonts[$font_family[0]]['version']) { |
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self::$fonts[$font_family[0]]['specs'] = explode(',', rtrim($font_family[1], ',')); |
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} else { |
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self::$fonts[$font_family[0]]['specs'] = array_merge(self::$fonts[$font_family[0]]['specs'], explode(',', rtrim($font_family[1], ','))); |
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} |
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} |
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} |
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self::$fonts[$font_family[0]]['version'] = 'V1'; |
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} |
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|
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// Add subsets |
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if (isset($font_elements['subset'])) { |
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self::$subsets = array_merge(self::$subsets, explode(',', $font_elements['subset'])); |
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} |
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} |
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|
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/** |
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* Parses google font api version 2 url |
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*/ |
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private static function parse_font_api2_url($font) { |
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$parsed_url = parse_url($font, PHP_URL_QUERY); |
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$query_elements = explode('&', $parsed_url); |
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foreach ($query_elements as $element) { |
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$family_str = str_replace('family=', '', $element); |
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$family = explode(':', $family_str); |
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if (!empty($family)) { |
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$font_name = $family[0]; |
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$font_elements = isset($family[1]) ? explode('@', $family[1]) : ''; |
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if (!empty($font_elements) && !empty($font_elements[0]) && !empty($font_elements[1])) { |
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$font_styles = $font_elements[0]; |
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$font_units = explode(',', $font_elements[1]); |
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} |
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} else { |
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$font_name = $family_str; |
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continue; |
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} |
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|
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if (!isset(self::$fonts[$font_name])) { |
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self::$fonts[$font_name]['specs'] = array( |
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'wght' => array(), |
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'ital' => array(), |
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'ital,wght' => array(), |
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); |
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} |
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|
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if (!isset(self::$fonts[$font_name]['version'])) { |
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self::$fonts[$font_name]['version'] = 'V2'; |
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} |
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if (isset($font_styles) && isset($font_units) && isset($font_elements[1])) { |
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$font_units = explode(';', $font_elements[1]); |
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switch ($font_styles) { |
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case 'wght': |
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foreach ($font_units as $font_unit) { |
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if (!in_array($font_unit, self::$fonts[$font_name]['specs']['wght'])) { |
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array_push(self::$fonts[$font_name]['specs']['wght'], $font_unit); |
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} |
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} |
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break; |
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case 'ital': |
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foreach ($font_units as $font_unit) { |
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if (!in_array($font_unit, self::$fonts[$font_name]['specs']['ital'])) { |
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array_push(self::$fonts[$font_name]['specs']['ital'], $font_unit); |
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} |
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} |
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break; |
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case 'ital,wght': |
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foreach ($font_units as $font_unit) { |
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if (!in_array($font_unit, self::$fonts[$font_name]['specs']['ital,wght'])) { |
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array_push(self::$fonts[$font_name]['specs']['ital,wght'], $font_unit); |
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} |
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} |
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break; |
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} |
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} |
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} |
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} |
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|
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/** |
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* Converts google font api version 1 font specification into API V2 |
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*/ |
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private static function convert_v1_font_specs_to_v2() { |
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foreach (self::$fonts as $font_name => $font_details) { |
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if ('V2' == $font_details['version']) continue; |
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if (0 == count($font_details['specs'])) { |
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self::$fonts[$font_name]['specs'] = array( |
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'wght' => array(), |
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'ital' => array(), |
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'ital,wght' => array(), |
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); |
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} else { |
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foreach ($font_details['specs'] as $key => $detail) { |
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if (is_array($detail)) $detail = implode('', $detail); |
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switch ($detail) { |
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case 'i': |
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unset(self::$fonts[$font_name]['specs'][$key]); |
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self::$fonts[$font_name]['specs']['ital'] = array(1); |
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break; |
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case 'b': |
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unset(self::$fonts[$font_name]['specs'][$key]); |
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self::$fonts[$font_name]['specs']['wght'] = array(); |
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break; |
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case 'bi': |
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unset(self::$fonts[$font_name]['specs'][$key]); |
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self::$fonts[$font_name]['specs']['ital'] = array('0;1'); |
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break; |
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default: |
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unset(self::$fonts[$font_name]['specs'][$key]); |
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if (!isset(self::$fonts[$font_name]['specs']['ital,wght'])) { |
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self::$fonts[$font_name]['specs']['ital,wght'] = array(); |
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} |
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if (false !== strpos($detail, 'i')) { |
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$detail = str_replace(array('italic', 'i'), '', $detail); |
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$detail = '' === $detail ? 400 : $detail; |
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array_push(self::$fonts[$font_name]['specs']['ital,wght'], '1,' . $detail); |
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} else { |
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$detail = 'regular' === $detail ? 400 : $detail; |
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array_push(self::$fonts[$font_name]['specs']['ital,wght'], '0,' . $detail); |
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} |
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break; |
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} |
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} |
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} |
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} |
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} |
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|
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/** |
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* Build valid Google font api 2 url string |
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* |
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* @return string $result Url string |
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*/ |
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private static function build() { |
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$result = ''; |
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foreach (self::$fonts as $font_name => $font_details) { |
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if ('display=swap' == $font_name) continue; |
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if ('' != $result) { |
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$result .= '&'; |
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} |
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$result .= 'family=' . str_replace(' ', '+', $font_name); |
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$result .= self::specs_to_string($font_details['specs']); |
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} |
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return $result; |
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} |
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|
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/** |
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* Converts font specifications into a valid google font api2 url string |
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* |
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* @param array $font_specs Font style and weight specifications |
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* |
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* @return string |
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*/ |
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private static function specs_to_string($font_specs) { |
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$result = array(); |
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$weights = isset($font_specs['wght']) && count($font_specs['wght']); |
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$italic_weights = isset($font_specs['ital']) && count($font_specs['ital']); |
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$all_weights = isset($font_specs['ital,wght']) && count($font_specs['ital,wght']); |
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|
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// Nothing is set, return |
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if (!$weights && !$italic_weights && !$all_weights) { |
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return ''; |
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} |
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|
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// Italic only |
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if ($italic_weights && !$weights && !$all_weights) { |
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if ('1' == $font_specs['ital'][0]) { |
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return ':ital@1'; |
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} elseif ('0;1' == $font_specs['ital'][0]) { |
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return ':ital@0;1'; |
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} |
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} |
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|
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foreach ($font_specs as $style => $units) { |
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switch ($style) { |
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case 'wght': |
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foreach ($units as $unit) { |
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$multiple_units = explode(',', $unit); |
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if (count($multiple_units) > 0) { |
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foreach ($multiple_units as $single_unit) { |
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array_push($result, '0,' . $single_unit); |
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} |
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} else { |
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array_push($result, '0,' . $unit); |
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} |
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} |
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break; |
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case 'ital': |
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foreach ($units as $unit) { |
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array_push($result, 1 == $unit ? '1,400' : $unit); |
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} |
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break; |
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case 'ital,wght': |
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foreach ($units as $unit) { |
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array_push($result, $unit); |
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} |
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break; |
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} |
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} |
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|
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sort($result); |
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return ':ital,wght@' . implode(';', array_unique($result)); |
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} |
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} |
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|
