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<?php |
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namespace Digia\GraphQL\Type\Definition; |
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use Digia\GraphQL\Error\InvariantException; |
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use function Digia\GraphQL\Type\isAssocArray; |
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use function Digia\GraphQL\Type\isValidResolver; |
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use function Digia\GraphQL\Type\resolveThunk; |
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use function Digia\GraphQL\Util\invariant; |
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use function Digia\GraphQL\Util\toString; |
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trait FieldsTrait |
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{ |
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/** |
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* @var array|callable |
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*/ |
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private $_fieldsThunk; |
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/** |
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* @var Field[] |
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*/ |
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private $_fieldMap = []; |
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/** |
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* @var bool |
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*/ |
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private $_isFieldMapDefined = false; |
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/** |
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* @return Field[] |
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*/ |
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public function getFields(): array |
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{ |
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$this->defineFieldMapIfNecessary(); |
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return $this->_fieldMap; |
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} |
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/** |
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* |
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*/ |
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protected function defineFieldMapIfNecessary(): void |
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{ |
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// Fields are built lazily to avoid concurrency issues. |
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if (!$this->_isFieldMapDefined) { |
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$this->_fieldMap = array_merge($this->defineFieldMap($this->_fieldsThunk), $this->_fieldMap); |
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$this->_isFieldMapDefined = true; |
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} |
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} |
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/** |
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* @param array|callable $fieldsThunk |
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* @return $this |
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*/ |
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protected function setFields($fieldsThunk) |
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{ |
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$this->_fieldsThunk = $fieldsThunk; |
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return $this; |
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} |
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/** |
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* @param mixed $fieldsThunk |
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* @return array |
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* @throws InvariantException |
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*/ |
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protected function defineFieldMap($fieldsThunk): array |
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{ |
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$fields = resolveThunk($fieldsThunk) ?: []; |
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invariant( |
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isAssocArray($fields), |
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sprintf( |
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'%s fields must be an associative array with field names as key or a callable which returns such an array.', |
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$this->getName() |
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) |
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); |
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$fieldMap = []; |
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foreach ($fields as $fieldName => $fieldConfig) { |
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invariant( |
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is_array($fieldConfig), |
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sprintf('%s.%s field config must be an array', $this->getName(), $fieldName) |
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); |
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invariant( |
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!isset($fieldConfig['isDeprecated']), |
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sprintf( |
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'%s.%s should provide "deprecationReason" instead of "isDeprecated".', |
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$this->getName(), |
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$fieldName |
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) |
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); |
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if (isset($fieldConfig['resolve'])) { |
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invariant( |
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$this->isValidResolver($fieldConfig['resolve']), |
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sprintf( |
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'%s.%s field resolver must be a function if provided, but got: %s', |
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$this->getName(), |
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$fieldName, |
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toString($fieldConfig['resolve']) |
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) |
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); |
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} |
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$fieldMap[$fieldName] = new Field(array_merge($fieldConfig, ['name' => $fieldName])); |
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} |
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return $fieldMap; |
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} |
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/** |
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* @param $resolver |
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* @return bool |
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*/ |
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protected function isValidResolver($resolver): bool |
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{ |
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return $resolver === null || \is_callable($resolver); |
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} |
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} |
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digiaonline /
graphql-php
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