TypeHelper::isEqualType() - Code Metrics - Inspection of "Refactor comparators to use the container" - digiaonline/graphql-php - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Pull Request — master (#170)

by Christoffer

created 2018-04-01 08:14 UTC

TypeHelper::isEqualType() B

↳ Parent: TypeHelper

Complexity

Conditions	6
Paths	4

Size

Total Lines	19
Code Lines	7

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
dl	0
loc	19
rs	8.8571
c	0
b	0
f	0
cc	6
eloc	7
nc	4
nop	2

<?php

namespace Digia\GraphQL\Util;

use Digia\GraphQL\Error\InvalidTypeException;
use Digia\GraphQL\Language\Node\ListTypeNode;
use Digia\GraphQL\Language\Node\NamedTypeNode;
use Digia\GraphQL\Language\Node\NonNullTypeNode;
use Digia\GraphQL\Language\Node\TypeNodeInterface;
use Digia\GraphQL\Type\Definition\AbstractTypeInterface;
use Digia\GraphQL\Type\Definition\LeafTypeInterface;
use Digia\GraphQL\Type\Definition\ListType;
use Digia\GraphQL\Type\Definition\NonNullType;
use Digia\GraphQL\Type\Definition\ObjectType;
use Digia\GraphQL\Type\Definition\TypeInterface;
use function Digia\GraphQL\Type\newList;
use function Digia\GraphQL\Type\newNonNull;
use Digia\GraphQL\Schema\SchemaInterface;

class TypeHelper
{
    /**
     * Provided two types, return true if the types are equal (invariant).
     *
     * @param TypeInterface $typeA
     * @param TypeInterface $typeB
     * @return bool
     */
    public function isEqualType(TypeInterface $typeA, TypeInterface $typeB): bool
    {
        // Equivalent types are equal.
        if ($typeA === $typeB) {
            return true;
        }

        // If either type is non-null, the other must also be non-null.
        if ($typeA instanceof NonNullType && $typeB instanceof NonNullType) {
            return $this->isEqualType($typeA->getOfType(), $typeB->getOfType());
        }

        // If either type is a list, the other must also be a list.
        if ($typeA instanceof ListType && $typeB instanceof ListType) {
            return $this->isEqualType($typeA->getOfType(), $typeB->getOfType());
        }

        // 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).
     *
     * @param SchemaInterface $schema
     * @param TypeInterface   $maybeSubtype
     * @param TypeInterface   $superType
     * @return bool
     */
    public function isTypeSubtypeOf(
        SchemaInterface $schema,
        TypeInterface $maybeSubtype,
        TypeInterface $superType
    ): bool {
        // Equivalent type is a valid subtype.
        if ($maybeSubtype === $superType) {
            return true;
        }

        // If superType is non-null, maybeSubType must also be non-null.
        if ($superType instanceof NonNullType) {
            if ($maybeSubtype instanceof NonNullType) {
                return $this->isTypeSubtypeOf($schema, $maybeSubtype->getOfType(), $superType->getOfType());
            }
            return false;
        }

        if ($maybeSubtype instanceof NonNullType) {
            // If superType is nullable, maybeSubType may be non-null or nullable.
            return $this->isTypeSubtypeOf($schema, $maybeSubtype->getOfType(), $superType);
        }

        // If superType type is a list, maybeSubType type must also be a list.
        if ($superType instanceof ListType) {
            if ($maybeSubtype instanceof ListType) {
                return $this->isTypeSubtypeOf($schema, $maybeSubtype->getOfType(), $superType->getOfType());
            }
            return false;
        }

        if ($maybeSubtype instanceof ListType) {
            // If superType is not a list, maybeSubType must also be not a list.
            return false;
        }

        // If superType type is an abstract type, maybeSubType type may be a currently
        // possible object type.
        if ($superType instanceof AbstractTypeInterface &&
            $maybeSubtype instanceof ObjectType &&
            $schema->isPossibleType($superType, $maybeSubtype)) {
            return true;
        }

        // Otherwise, the child type is not a valid subtype of the parent type.
        return false;
    }

    /**
     * Provided two composite types, determine if they "overlap". Two composite
     * types overlap when the Sets of possible concrete types for each intersect.
     *
     * This is often used to determine if a fragment of a given type could possibly
     * be visited in a context of another type.
     *
     * @param SchemaInterface $schema
     * @param TypeInterface   $typeA
     * @param TypeInterface   $typeB
     * @return bool
     */
    public function doTypesOverlap(SchemaInterface $schema, TypeInterface $typeA, TypeInterface $typeB): bool
    {
        // Equivalent types overlap
        if ($typeA === $typeB) {
            return true;
        }

        if ($typeA instanceof AbstractTypeInterface) {
            if ($typeB instanceof AbstractTypeInterface) {
                // If both types are abstract, then determine if there is any intersection
                // between possible concrete types of each.
                return arraySome($schema->getPossibleTypes($typeA),
                    function (TypeInterface $type) use ($schema, $typeB) {
                        return $schema->isPossibleType($typeB, $type);
                    });
            }

            // Determine if the latter type is a possible concrete type of the former.
            /** @noinspection PhpParamsInspection */
            return $schema->isPossibleType($typeA, $typeB);
        }

        if ($typeB instanceof AbstractTypeInterface) {
            // Determine if the former type is a possible concrete type of the latter.
            /** @noinspection PhpParamsInspection */
            return $schema->isPossibleType($typeB, $typeA);
        }

        // Otherwise the types do not overlap.
        return false;
    }

    /**
     * Two types conflict if both types could not apply to a value simultaneously.
     * Composite types are ignored as their individual field types will be compared
     * later recursively. However List and Non-Null types must match.
     *
     * @param TypeInterface $typeA
     * @param TypeInterface $typeB
     * @return bool
     */
    public function compareTypes(TypeInterface $typeA, TypeInterface $typeB): bool
    {
        if ($typeA instanceof ListType) {
            return $typeB instanceof ListType
                ? $this->compareTypes($typeA->getOfType(), $typeB->getOfType())
                : true;
        }
        if ($typeB instanceof ListType) {
            return true;
        }
        if ($typeA instanceof NonNullType) {
            return $typeB instanceof NonNullType
                ? $this->compareTypes($typeA->getOfType(), $typeB->getOfType())
                : true;
        }
        if ($typeB instanceof NonNullType) {
            return true;
        }
        if ($typeA instanceof LeafTypeInterface || $typeB instanceof LeafTypeInterface) {
            return $typeA !== $typeB;
        }
        return false;
    }

    /**
     * Given a Schema and an AST node describing a type, return a GraphQLType
     * definition which applies to that type. For example, if provided the parsed
     * AST node for `[User]`, a GraphQLList instance will be returned, containing
     * the type called "User" found in the schema. If a type called "User" is not
     * found in the schema, then undefined will be returned.
     *
     * @param SchemaInterface   $schema
     * @param TypeNodeInterface $typeNode
     * @return TypeInterface|null
     * @throws InvalidTypeException
     */
    public function fromAST(SchemaInterface $schema, TypeNodeInterface $typeNode): ?TypeInterface
    {
        $innerType = null;

        if ($typeNode instanceof ListTypeNode) {
            $innerType = $this->fromAST($schema, $typeNode->getType());
            return null !== $innerType ? newList($innerType) : null;
        }

        if ($typeNode instanceof NonNullTypeNode) {
            $innerType = $this->fromAST($schema, $typeNode->getType());
            return null !== $innerType ? newNonNull($innerType) : null;
        }

        if ($typeNode instanceof NamedTypeNode) {
            return $schema->getType($typeNode->getNameValue());
        }

        throw new InvalidTypeException(sprintf('Unexpected type kind: %s', $typeNode->getKind()));
    }
}


1			<?php
2
3			namespace Digia\GraphQL\Util;
4
5			use Digia\GraphQL\Error\InvalidTypeException;
6			use Digia\GraphQL\Language\Node\ListTypeNode;
7			use Digia\GraphQL\Language\Node\NamedTypeNode;
8			use Digia\GraphQL\Language\Node\NonNullTypeNode;
9			use Digia\GraphQL\Language\Node\TypeNodeInterface;
10			use Digia\GraphQL\Type\Definition\AbstractTypeInterface;
11			use Digia\GraphQL\Type\Definition\LeafTypeInterface;
12			use Digia\GraphQL\Type\Definition\ListType;
13			use Digia\GraphQL\Type\Definition\NonNullType;
14			use Digia\GraphQL\Type\Definition\ObjectType;
15			use Digia\GraphQL\Type\Definition\TypeInterface;
16			use function Digia\GraphQL\Type\newList;
17			use function Digia\GraphQL\Type\newNonNull;
18			use Digia\GraphQL\Schema\SchemaInterface;
19
20			class TypeHelper
21			{
22			/**
23			* Provided two types, return true if the types are equal (invariant).
24			*
25			* @param TypeInterface $typeA
26			* @param TypeInterface $typeB
27			* @return bool
28			*/
29			public function isEqualType(TypeInterface $typeA, TypeInterface $typeB): bool
30			{
31			// Equivalent types are equal.
32			if ($typeA === $typeB) {
33			return true;
34			}
35
36			// If either type is non-null, the other must also be non-null.
37			if ($typeA instanceof NonNullType && $typeB instanceof NonNullType) {
38			return $this->isEqualType($typeA->getOfType(), $typeB->getOfType());
39			}
40
41			// If either type is a list, the other must also be a list.
42			if ($typeA instanceof ListType && $typeB instanceof ListType) {
43			return $this->isEqualType($typeA->getOfType(), $typeB->getOfType());
44			}
45
46			// Otherwise the types are not equal.
47			return false;
48			}
49
50			/**
51			* Provided a type and a super type, return true if the first type is either
52			* equal or a subset of the second super type (covariant).
53			*
54			* @param SchemaInterface $schema
55			* @param TypeInterface $maybeSubtype
56			* @param TypeInterface $superType
57			* @return bool
58			*/
59			public function isTypeSubtypeOf(
60			SchemaInterface $schema,
61			TypeInterface $maybeSubtype,
62			TypeInterface $superType
63			): bool {
64			// Equivalent type is a valid subtype.
65			if ($maybeSubtype === $superType) {
66			return true;
67			}
68
69			// If superType is non-null, maybeSubType must also be non-null.
70			if ($superType instanceof NonNullType) {
71			if ($maybeSubtype instanceof NonNullType) {
72			return $this->isTypeSubtypeOf($schema, $maybeSubtype->getOfType(), $superType->getOfType());
73			}
74			return false;
75			}
76
77			if ($maybeSubtype instanceof NonNullType) {
78			// If superType is nullable, maybeSubType may be non-null or nullable.
79			return $this->isTypeSubtypeOf($schema, $maybeSubtype->getOfType(), $superType);
80			}
81
82			// If superType type is a list, maybeSubType type must also be a list.
83			if ($superType instanceof ListType) {
84			if ($maybeSubtype instanceof ListType) {
85			return $this->isTypeSubtypeOf($schema, $maybeSubtype->getOfType(), $superType->getOfType());
86			}
87			return false;
88			}
89
90			if ($maybeSubtype instanceof ListType) {
91			// If superType is not a list, maybeSubType must also be not a list.
92			return false;
93			}
94
95			// If superType type is an abstract type, maybeSubType type may be a currently
96			// possible object type.
97			if ($superType instanceof AbstractTypeInterface &&
98			$maybeSubtype instanceof ObjectType &&
99			$schema->isPossibleType($superType, $maybeSubtype)) {
100			return true;
101			}
102
103			// Otherwise, the child type is not a valid subtype of the parent type.
104			return false;
105			}
106
107			/**
108			* Provided two composite types, determine if they "overlap". Two composite
109			* types overlap when the Sets of possible concrete types for each intersect.
110			*
111			* This is often used to determine if a fragment of a given type could possibly
112			* be visited in a context of another type.
113			*
114			* @param SchemaInterface $schema
115			* @param TypeInterface $typeA
116			* @param TypeInterface $typeB
117			* @return bool
118			*/
119			public function doTypesOverlap(SchemaInterface $schema, TypeInterface $typeA, TypeInterface $typeB): bool
120			{
121			// Equivalent types overlap
122			if ($typeA === $typeB) {
123			return true;
124			}
125
126			if ($typeA instanceof AbstractTypeInterface) {
127			if ($typeB instanceof AbstractTypeInterface) {
128			// If both types are abstract, then determine if there is any intersection
129			// between possible concrete types of each.
130			return arraySome($schema->getPossibleTypes($typeA),
131			function (TypeInterface $type) use ($schema, $typeB) {
132			return $schema->isPossibleType($typeB, $type);
133			});
134			}
135
136			// Determine if the latter type is a possible concrete type of the former.
137			/** @noinspection PhpParamsInspection */
138			return $schema->isPossibleType($typeA, $typeB);
139			}
140
141			if ($typeB instanceof AbstractTypeInterface) {
142			// Determine if the former type is a possible concrete type of the latter.
143			/** @noinspection PhpParamsInspection */
144			return $schema->isPossibleType($typeB, $typeA);
145			}
146
147			// Otherwise the types do not overlap.
148			return false;
149			}
150
151			/**
152			* Two types conflict if both types could not apply to a value simultaneously.
153			* Composite types are ignored as their individual field types will be compared
154			* later recursively. However List and Non-Null types must match.
155			*
156			* @param TypeInterface $typeA
157			* @param TypeInterface $typeB
158			* @return bool
159			*/
160			public function compareTypes(TypeInterface $typeA, TypeInterface $typeB): bool
161			{
162			if ($typeA instanceof ListType) {
163			return $typeB instanceof ListType
164			? $this->compareTypes($typeA->getOfType(), $typeB->getOfType())
165			: true;
166			}
167			if ($typeB instanceof ListType) {
168			return true;
169			}
170			if ($typeA instanceof NonNullType) {
171			return $typeB instanceof NonNullType
172			? $this->compareTypes($typeA->getOfType(), $typeB->getOfType())
173			: true;
174			}
175			if ($typeB instanceof NonNullType) {
176			return true;
177			}
178			if ($typeA instanceof LeafTypeInterface \|\| $typeB instanceof LeafTypeInterface) {
179			return $typeA !== $typeB;
180			}
181			return false;
182			}
183
184			/**
185			* Given a Schema and an AST node describing a type, return a GraphQLType
186			* definition which applies to that type. For example, if provided the parsed
187			* AST node for `[User]`, a GraphQLList instance will be returned, containing
188			* the type called "User" found in the schema. If a type called "User" is not
189			* found in the schema, then undefined will be returned.
190			*
191			* @param SchemaInterface $schema
192			* @param TypeNodeInterface $typeNode
193			* @return TypeInterface\|null
194			* @throws InvalidTypeException
195			*/
196			public function fromAST(SchemaInterface $schema, TypeNodeInterface $typeNode): ?TypeInterface
197			{
198			$innerType = null;
199
200			if ($typeNode instanceof ListTypeNode) {
201			$innerType = $this->fromAST($schema, $typeNode->getType());
202			return null !== $innerType ? newList($innerType) : null;
203			}
204
205			if ($typeNode instanceof NonNullTypeNode) {
206			$innerType = $this->fromAST($schema, $typeNode->getType());
207			return null !== $innerType ? newNonNull($innerType) : null;
208			}
209
210			if ($typeNode instanceof NamedTypeNode) {
211			return $schema->getType($typeNode->getNameValue());
212			}
213
214			throw new InvalidTypeException(sprintf('Unexpected type kind: %s', $typeNode->getKind()));
215			}
216			}
217

digiaonline / graphql-php

Pull Request — master (#170)

TypeHelper::isEqualType() B

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