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<?php |
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namespace Frontend\Core\Header; |
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use InvalidArgumentException; |
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final class MetaLink |
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{ |
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/** @var array */ |
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private $attributes; |
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/** @var string */ |
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private $uniqueKey; |
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/** |
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* @param string $href since we always need a href we've added it as a separate parameter |
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* @param string[] $attributes |
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* @param string[] $uniqueAttributeKeys |
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* |
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* @throws InvalidArgumentException when the content is empty |
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*/ |
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public function __construct( |
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string $href, |
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array $attributes, |
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array $uniqueAttributeKeys = ['rel', 'hreflang', 'type', 'title'] |
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) { |
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if (empty($href)) { |
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throw new InvalidArgumentException('The href can not be empty'); |
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} |
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$this->attributes = ['href' => $href] + $attributes; |
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$this->createUniqueKey($uniqueAttributeKeys); |
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} |
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/** |
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* @param string[] $uniqueAttributeKeys |
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*/ |
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private function createUniqueKey(array $uniqueAttributeKeys): void |
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{ |
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// make sure the keys are sorted alphabetically |
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sort($uniqueAttributeKeys); |
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$this->uniqueKey = implode( |
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'|', |
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array_filter( |
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array_map( |
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function (string $attributeKey) { |
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return $this->attributes[$attributeKey] ?? ''; |
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}, |
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$uniqueAttributeKeys |
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) |
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) |
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); |
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} |
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public function getUniqueKey(): string |
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{ |
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return $this->uniqueKey; |
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} |
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public function hasAttributeWithValue(string $attributeKey, string $attributeValue): bool |
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{ |
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return isset($this->attributes[$attributeKey]) && $this->attributes[$attributeKey] === $attributeValue; |
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} |
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public static function canonical(string $href): self |
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{ |
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return new self( |
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$href, |
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['rel' => 'canonical'] |
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); |
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} |
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public static function rss(string $href, string $title): self |
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{ |
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return new self( |
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$href, |
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['rel' => 'alternate', 'type' => 'application/rss+xml', 'title' => $title] |
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); |
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} |
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public static function alternateLanguage(string $href, string $language): self |
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{ |
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return new self( |
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$href, |
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['rel' => 'alternate', 'hreflang' => $language] |
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); |
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} |
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public static function next(string $href): self |
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{ |
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return new self( |
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$href, |
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['rel' => 'next'] |
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); |
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} |
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public static function previous(string $href): self |
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{ |
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return new self( |
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$href, |
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['rel' => 'prev'] |
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); |
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} |
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public function __toString(): string |
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{ |
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$html = '<link '; |
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$html .= implode( |
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' ', |
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array_map( |
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function (string $parameterKey, string $parameterValue) { |
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return $parameterKey . '="' . $parameterValue . '"'; |
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}, |
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array_keys($this->attributes), |
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$this->attributes |
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) |
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); |
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$html .= '>'; |
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return $html; |
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} |
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} |
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forkcms /
forkcms
