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

Passed

Pull Request — master (#158)

by Christoffer

created 2018-03-29 13:49 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\ListType;
use Digia\GraphQL\Type\Definition\NonNullType;
use Digia\GraphQL\Type\Definition\ObjectType;
use Digia\GraphQL\Type\Definition\TypeInterface;
use function Digia\GraphQL\Type\GraphQLList;
use function Digia\GraphQL\Type\GraphQLNonNull;
use Digia\GraphQL\Type\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;
    }

    /**
     * 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 !== $innerType ? GraphQLList($innerType) : null;
        }

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

digiaonline / graphql-php

Pull Request — master (#158)

TypeHelper::isEqualType() B

Complexity

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Duplication

Importance

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