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<?php |
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declare(strict_types=1); |
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namespace GraphQL\Utils; |
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use GraphQL\Type\Definition\AbstractType; |
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use GraphQL\Type\Definition\CompositeType; |
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use GraphQL\Type\Definition\ListOfType; |
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use GraphQL\Type\Definition\NonNull; |
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use GraphQL\Type\Definition\ObjectType; |
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use GraphQL\Type\Definition\Type; |
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use GraphQL\Type\Schema; |
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class TypeComparators |
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{ |
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/** |
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* Provided two types, return true if the types are equal (invariant). |
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* |
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* @return bool |
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*/ |
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public static function isEqualType(Type $typeA, Type $typeB) |
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{ |
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// Equivalent types are equal. |
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if ($typeA === $typeB) { |
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return true; |
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} |
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// If either type is non-null, the other must also be non-null. |
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if ($typeA instanceof NonNull && $typeB instanceof NonNull) { |
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return self::isEqualType($typeA->getWrappedType(), $typeB->getWrappedType()); |
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} |
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// If either type is a list, the other must also be a list. |
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if ($typeA instanceof ListOfType && $typeB instanceof ListOfType) { |
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return self::isEqualType($typeA->getWrappedType(), $typeB->getWrappedType()); |
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} |
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// Otherwise the types are not equal. |
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return false; |
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} |
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/** |
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* Provided a type and a super type, return true if the first type is either |
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* equal or a subset of the second super type (covariant). |
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* |
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* @return bool |
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*/ |
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public static function isTypeSubTypeOf(Schema $schema, Type $maybeSubType, Type $superType) |
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{ |
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// Equivalent type is a valid subtype |
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if ($maybeSubType === $superType) { |
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return true; |
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} |
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// If superType is non-null, maybeSubType must also be nullable. |
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if ($superType instanceof NonNull) { |
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if ($maybeSubType instanceof NonNull) { |
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return self::isTypeSubTypeOf($schema, $maybeSubType->getWrappedType(), $superType->getWrappedType()); |
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} |
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return false; |
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} |
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if ($maybeSubType instanceof NonNull) { |
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// If superType is nullable, maybeSubType may be non-null. |
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return self::isTypeSubTypeOf($schema, $maybeSubType->getWrappedType(), $superType); |
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} |
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// If superType type is a list, maybeSubType type must also be a list. |
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if ($superType instanceof ListOfType) { |
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if ($maybeSubType instanceof ListOfType) { |
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return self::isTypeSubTypeOf($schema, $maybeSubType->getWrappedType(), $superType->getWrappedType()); |
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} |
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2 |
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return false; |
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} |
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if ($maybeSubType instanceof ListOfType) { |
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// If superType is not a list, maybeSubType must also be not a list. |
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return false; |
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} |
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// If superType type is an abstract type, maybeSubType type may be a currently |
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// possible object type. |
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return Type::isAbstractType($superType) && |
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$maybeSubType instanceof ObjectType && |
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2 |
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$schema->isPossibleType( |
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$superType, |
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$maybeSubType |
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); |
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} |
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/** |
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* Provided two composite types, determine if they "overlap". Two composite |
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* types overlap when the Sets of possible concrete types for each intersect. |
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* |
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* This is often used to determine if a fragment of a given type could possibly |
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* be visited in a context of another type. |
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* |
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* This function is commutative. |
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* |
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* @return bool |
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*/ |
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public static function doTypesOverlap(Schema $schema, CompositeType $typeA, CompositeType $typeB) |
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{ |
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// Equivalent types overlap |
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if ($typeA === $typeB) { |
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return true; |
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} |
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if ($typeA instanceof AbstractType) { |
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if ($typeB instanceof AbstractType) { |
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// If both types are abstract, then determine if there is any intersection |
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// between possible concrete types of each. |
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foreach ($schema->getPossibleTypes($typeA) as $type) { |
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if ($schema->isPossibleType($typeB, $type)) { |
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return true; |
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} |
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} |
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return false; |
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} |
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// Determine if the latter type is a possible concrete type of the former. |
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return $schema->isPossibleType($typeA, $typeB); |
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} |
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if ($typeB instanceof AbstractType) { |
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// Determine if the former type is a possible concrete type of the latter. |
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return $schema->isPossibleType($typeB, $typeA); |
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} |
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// Otherwise the types do not overlap. |
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return false; |
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} |
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} |
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webonyx /
graphql-php
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