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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 MetaData |
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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 $content since we always need content 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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* @param string|null $uniqueKeySuffix |
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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 $content, |
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array $attributes, |
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array $uniqueAttributeKeys = ['content'], |
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string $uniqueKeySuffix = null |
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) { |
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if (empty($content)) { |
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throw new InvalidArgumentException('The content can not be empty'); |
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} |
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$this->attributes = ['content' => $content] + $attributes; |
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$this->createUniqueKey($uniqueAttributeKeys, $uniqueKeySuffix); |
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} |
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/** |
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* @param string[] $uniqueAttributeKeys |
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* @param string|null $uniqueKeySuffix |
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*/ |
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private function createUniqueKey(array $uniqueAttributeKeys, string $uniqueKeySuffix = null): void |
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{ |
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// make sure the keys are sorted alphabetically |
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sort($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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$uniqueAttributeKeys |
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) |
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) |
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); |
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if ($uniqueKeySuffix !== null) { |
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$this->uniqueKey .= '|' . $uniqueKeySuffix; |
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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] === $attributeValue; |
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} |
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/** |
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* Some things should be appended instead of ignored when the meta data is already set instead of ignored. |
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* |
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* @return bool |
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*/ |
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public function shouldMergeOnDuplicateKey(): bool |
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{ |
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return in_array($this->uniqueKey, ['description', 'keywords', 'robots'], true); |
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} |
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public function merge(self $metaData): void |
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{ |
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foreach ($metaData->attributes as $attributeKey => $attributeValue) { |
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// the content should be appended, the rest of the attributes gets overwritten or added |
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if ($attributeKey === 'content' && isset($this->attributes[$attributeKey])) { |
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$this->attributes[$attributeKey] .= ', ' . $attributeValue; |
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continue; |
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} |
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$this->attributes[$attributeKey] = $attributeValue; |
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} |
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} |
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public static function forName( |
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string $name, |
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string $content |
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): self { |
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return new self($content, ['name' => $name], ['name']); |
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} |
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public static function forProperty( |
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string $property, |
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string $content, |
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array $uniqueAttributeKeys = ['property'] |
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): self { |
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return new self($content, ['property' => $property], $uniqueAttributeKeys); |
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} |
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public function __toString(): string |
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{ |
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$html = '<meta '; |
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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
