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<?php |
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namespace ZWF; |
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use ZWF\GoogleFontsCollection as Collection; |
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class GoogleFontsOptimizerUtils |
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{ |
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/** |
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* Replaces any occurrences of un-encoded ampersands in the given string |
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* with the value given in the `$amp` parameter (`&` by default). |
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* |
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* @param string $url |
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* @param string $amp |
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* |
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* @return string |
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*/ |
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public static function encodeUnencodedAmpersands($url, $amp = '&') |
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{ |
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$amp = trim($amp); |
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if (empty($amp)) { |
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$amp = '&'; |
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} |
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return preg_replace('/&(?!#?\w+;)/', $amp, $url); |
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} |
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/** |
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* Replaces protocol-relative or non-https URLs into https URLs. |
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* |
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* @param string $link |
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* |
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* @return string |
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*/ |
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public static function httpsify($link) |
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{ |
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$is_protocol_relative = ('/' === $link{0} && '/' === $link{1}); |
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if ($is_protocol_relative) { |
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$link = 'https:' . $link; |
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} else { |
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$link = preg_replace('/^(https?):\/\//mi', '', $link); |
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$link = 'https://' . $link; |
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} |
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return $link; |
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} |
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/** |
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* Returns true if a given `$url` is a Google Fonts URL. |
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* |
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* @param string $url |
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* |
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* @return bool |
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*/ |
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public static function isGoogleWebFontUrl($url) |
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{ |
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return (substr_count($url, 'fonts.googleapis.com/css') > 0); |
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} |
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/** |
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* Returns true if given `$string` contains the HTML5 doctype. |
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* |
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* @param string $string |
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* |
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* @return bool |
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*/ |
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public static function hasHtml5Doctype($string) |
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{ |
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return (preg_match('/^<!DOCTYPE.+html>/i', $string) > 0); |
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} |
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/** |
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* Returns true when given `$string` contains an XSL stylesheet element. |
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* |
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* @param string $string |
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* |
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* @return bool |
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*/ |
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public static function hasXslStylesheet($string) |
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{ |
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return (false !== stripos($string, '<xsl:stylesheet')); |
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} |
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/** |
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* Returns true when given `$string` contains the beginnings of an `<html>` tag. |
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* |
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* @param string $string |
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* @return bool |
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*/ |
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public static function hasHtmlTag($string) |
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{ |
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return (false !== stripos($string, '<html')); |
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} |
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/** |
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* Given a `['key' => 'value1,value2,value3']` or a |
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* `['key' => ['value1', 'value2', 'value3']]` map/array it returns a new |
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* array with the same keys, but the values are now always an array of |
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* values (and any potential duplicate values are removed). |
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* If the `$sort` parameter is given, the list of values is sorted using |
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* `sort()` and the `$sort` parameter is treated as a sort flag. |
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* |
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* @param array $data |
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* @param bool|int $sort If false, no sorting, otherwise an integer representing |
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* sort flags. See http://php.net/sort |
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* |
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* @return array |
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*/ |
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public static function dedupValues(array $data, $sort = false) |
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{ |
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foreach ($data as $key => $values) { |
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if (is_array($values)) { |
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$parts = $values; |
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} else { |
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$parts = explode(',', $values); |
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} |
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$parts = array_unique($parts); |
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// Perform sort if specified |
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if (false !== $sort) { |
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sort($parts, (int) $sort); |
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} |
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// Store back |
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$data[$key] = $parts; |
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} |
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return $data; |
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} |
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/** |
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* Given a `GoogleFontsCollection` it builds needed `<link rel="stylesheet">` markup. |
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* |
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* @param Collection $fonts |
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* |
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* @return string |
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*/ |
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public static function buildFontsMarkupLinks(Collection $fonts) |
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{ |
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$font_url = $fonts->getCombinedUrl(); |
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$href = self::encodeUnencodedAmpersands($font_url); |
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$markup = '<link rel="stylesheet" type="text/css" href="' . $href . '">'; |
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foreach ($fonts->getTextUrls() as $url) { |
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$markup .= '<link rel="stylesheet" type="text/css"'; |
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$markup .= ' href="' . self::encodeUnencodedAmpersands($url) . '">'; |
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} |
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return $markup; |
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} |
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/** |
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* Given a `GoogleFontsCollection` it builds the WebFont loader script markup. |
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* |
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* @param Collection $collection |
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* |
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* @return string |
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*/ |
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public static function buildFontsMarkupScript(Collection $collection) |
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{ |
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$families_array = []; |
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list($names, $mapping) = $collection->getScriptData(); |
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foreach ($names as $name => $sizes) { |
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$family = $name . ':' . implode(',', $sizes); |
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if (isset($mapping[$name])) { |
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$family .= ':' . implode(',', $mapping[$name]); |
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} |
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$families_array[] = $family; |
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} |
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$families = "'" . implode("', '", $families_array) . "'"; |
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// Load 'text' requests with the "custom" module |
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$custom = ''; |
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if ($collection->hasText()) { |
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$custom = ",\n custom: {\n"; |
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$custom .= " families: [ '" . implode("', '", $collection->getTextNames()) . "' ],\n"; |
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$custom .= " urls: [ '" . implode("', '", $collection->getTextUrls()) . "' ]\n"; |
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$custom .= ' }'; |
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} |
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$markup = <<<MARKUP |
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<script type="text/javascript"> |
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WebFontConfig = { |
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google: { families: [ {$families} ] }{$custom} |
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}; |
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(function() { |
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var wf = document.createElement('script'); |
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wf.src = ('https:' == document.location.protocol ? 'https' : 'http') + |
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'://ajax.googleapis.com/ajax/libs/webfont/1/webfont.js'; |
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wf.type = 'text/javascript'; |
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wf.async = 'true'; |
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var s = document.getElementsByTagName('script')[0]; |
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s.parentNode.insertBefore(wf, s); |
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})(); |
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</script> |
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MARKUP; |
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return $markup; |
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} |
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/** |
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* Builds a combined Google Font URL for multiple font families/subsets. |
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* |
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* Usage examples: |
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* ``` |
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* ZWF\GoogleFontsOptimizerUtils::buildGoogleFontsUrl( |
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* [ |
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* 'Open Sans' => [ '400', '400italic', '700', '700italic' ], |
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* 'Ubuntu' => [ '400', '400italic', '700', '700italic' ], |
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* ), |
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* [ 'latin', 'latin-ext' ] |
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* ); |
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* ``` |
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* |
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* or |
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* |
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* ``` |
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* ZWF\GoogleFontsOptimizerUtils::buildGoogleFontsUrl( |
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* [ |
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* 'Open Sans' => '400,400italic,700,700italic', |
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* 'Ubuntu' => '400,400italic,700,700italic', |
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* ], |
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* 'latin,latin-ext' |
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* ); |
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* ``` |
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* |
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* @param array $fonts |
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* @param array|string $subsets |
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* |
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* @return null|string |
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*/ |
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public static function buildGoogleFontsUrl(array $fonts, $subsets = []) |
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{ |
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$base_url = 'https://fonts.googleapis.com/css'; |
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$font_args = []; |
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$family = []; |
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$fonts = self::dedupValues($fonts, false); // no sort |
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foreach ($fonts as $font_name => $font_weight) { |
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// Trimming end colon handles edge case of being given an empty $font_weight |
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$family[] = trim(trim($font_name) . ':' . implode(',', $font_weight), ':'); |
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} |
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$font_args['family'] = implode('|', $family); |
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if (! empty($subsets)) { |
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if (is_array($subsets)) { |
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$subsets = array_unique($subsets); |
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$subsets = implode(',', $subsets); |
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} |
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$font_args['subset'] = trim($subsets); |
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} |
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$url = $base_url . '?' . http_build_query($font_args); |
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return $url; |
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} |
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/** |
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* Flatten an array without recursion. |
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* |
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* @param array $arr |
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* |
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* @return array |
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*/ |
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public static function arrayFlattenIterative(array $arr) |
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{ |
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$flat = []; |
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$stack = array_values($arr); |
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while (! empty($stack)) { |
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$value = array_shift($stack); |
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if (is_array($value)) { |
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$stack = array_merge(array_values($value), $stack); |
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} else { |
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$flat[] = $value; |
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} |
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} |
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return $flat; |
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} |
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} |
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