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TypeComparators.php
<?php declare(strict_types=1); namespace GraphQL\Utils; use GraphQL\Error\InvariantViolation; use GraphQL\Type\Definition\ImplementingType; use GraphQL\Type\Definition\ListOfType; use GraphQL\Type\Definition\NonNull; use GraphQL\Type\Definition\Type; use GraphQL\Type\Schema; class TypeComparators { /** Provided two types, return true if the types are equal (invariant). */ public static function isEqualType(Type $typeA, Type $typeB): bool { // Equivalent types are equal. if ($typeA === $typeB) { return true; } // If either type is non-null, the other must also be non-null. if ($typeA instanceof NonNull && $typeB instanceof NonNull) { return self::isEqualType($typeA->getWrappedType(), $typeB->getWrappedType()); } // If either type is a list, the other must also be a list. if ($typeA instanceof ListOfType && $typeB instanceof ListOfType) { return self::isEqualType($typeA->getWrappedType(), $typeB->getWrappedType()); } // Otherwise the types are not equal. return false; } /** * Provided a type and a super type, return true if the first type is either * equal or a subset of the second super type (covariant). * * @throws InvariantViolation */ public static function isTypeSubTypeOf(Schema $schema, Type $maybeSubType, Type $superType): bool { // Equivalent type is a valid subtype if ($maybeSubType === $superType) { return true; } // If superType is non-null, maybeSubType must also be nullable. if ($superType instanceof NonNull) { if ($maybeSubType instanceof NonNull) { return self::isTypeSubTypeOf($schema, $maybeSubType->getWrappedType(), $superType->getWrappedType()); } return false; } if ($maybeSubType instanceof NonNull) { // If superType is nullable, maybeSubType may be non-null. return self::isTypeSubTypeOf($schema, $maybeSubType->getWrappedType(), $superType); } // If superType type is a list, maybeSubType type must also be a list. if ($superType instanceof ListOfType) { if ($maybeSubType instanceof ListOfType) { return self::isTypeSubTypeOf($schema, $maybeSubType->getWrappedType(), $superType->getWrappedType()); } return false; } if ($maybeSubType instanceof ListOfType) { // If superType is not a list, maybeSubType must also be not a list. return false; } if (Type::isAbstractType($superType)) { // If superType type is an abstract type, maybeSubType type may be a currently // possible object or interface type. return $maybeSubType instanceof ImplementingType && $schema->isSubType($superType, $maybeSubType); } return false; } }
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