QueryReducer::walkQuery() - Code Metrics - Inspection of "Implement query reducers." - drupal-graphql/graphql - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — 8.x-3.x (#519)

by Sebastian

created 2018-02-13 23:08 UTC

QueryReducer::walkQuery() C

↳ Parent: QueryReducer

Complexity

Conditions	12
Paths	4

Size

Total Lines	43
Code Lines	26

Duplication

Lines	10
Ratio	23.26 %

Importance

Changes

Metric	Value
cc	12
eloc	26
nc	4
nop	3
dl	10
loc	43
rs	5.1612
c	0
b	0
f	0

How to fix Complexity

<?php

namespace Drupal\graphql\GraphQL\Execution;

use Drupal\graphql\GraphQL\Execution\QueryVisitor\QueryVisitorInterface;
use Drupal\graphql\GraphQL\Utility\TypeCollector;
use Youshido\GraphQL\Execution\Request;
use Youshido\GraphQL\Field\FieldInterface;
use Youshido\GraphQL\Parser\Ast\AbstractAst;
use Youshido\GraphQL\Parser\Ast\Field;
use Youshido\GraphQL\Parser\Ast\Fragment;
use Youshido\GraphQL\Parser\Ast\FragmentReference;
use Youshido\GraphQL\Parser\Ast\Interfaces\FragmentInterface;
use Youshido\GraphQL\Parser\Ast\Mutation;
use Youshido\GraphQL\Parser\Ast\Query;
use Youshido\GraphQL\Parser\Ast\TypedFragmentReference;
use Youshido\GraphQL\Schema\AbstractSchema;
use Youshido\GraphQL\Type\InterfaceType\AbstractInterfaceType;
use Youshido\GraphQL\Type\Object\AbstractObjectType;

class QueryReducer {

  /**
   * @var \Youshido\GraphQL\Execution\Request
   */
  protected $request;

  /**
   * @var \Youshido\GraphQL\Schema\AbstractSchema
   */
  protected $schema;

  /**
   * @var \Youshido\GraphQL\Type\TypeInterface[]
   */
  protected $types;

  /**
   * QueryReducer constructor.
   *
   * @param \Youshido\GraphQL\Schema\AbstractSchema $schema
   * @param \Youshido\GraphQL\Execution\Request $request
   */
  public function __construct(AbstractSchema $schema, Request $request) {
    $this->schema = $schema;
    $this->request = $request;
    $this->types = TypeCollector::collectTypes($schema);
  }

  /**
   * @param \Drupal\graphql\GraphQL\Execution\QueryVisitor\QueryVisitorInterface $visitor
   *
   * @return mixed|\Youshido\GraphQL\Parser\Ast\Query
   */
  public function reduceQuery(QueryVisitorInterface $visitor) {
    $operations = $this->request->getAllOperations();

    return $visitor->finish(array_reduce($operations, function ($carry, $current) use ($visitor) {
      $type = $current instanceof Mutation ? $this->schema->getMutationType() : $this->schema->getQueryType();
      return $this->reduceOperation($current, $carry, $type, $visitor);
    }, $visitor->initial()));
  }

  /**
   * @param \Youshido\GraphQL\Parser\Ast\Query $query
   * @param $carry
   * @param $current
   * @param \Drupal\graphql\GraphQL\Execution\QueryVisitor\QueryVisitorInterface $visitor
   *
   * @return mixed|void
   */
  protected function reduceOperation(Query $query, $carry, $current, QueryVisitorInterface $visitor) {
    if (!($current instanceof AbstractObjectType) || !$current->hasField($query->getName())) {
      return;
    }

    if (($name = $query->getName()) && $current->hasField($name)) {
      $operation = $current->getField($query->getName());
      $walker = $this->walkQuery($query, $operation, $visitor);

      while ($walker->valid()) {
        /** @var \Youshido\GraphQL\Parser\Ast\Field $field */
        /** @var \Youshido\GraphQL\Field\Field $ast */
        list($field, $ast, $child) = $walker->current();

        $args = $field->getKeyValueArguments();
        $result = $visitor->visit($args, $ast, $child);
        $carry = $visitor->reduce($carry, $result);

        $walker->send($result);
      }
    }

    return $carry;
  }

  /**
   * @param $node
   * @param \Youshido\GraphQL\Field\FieldInterface $current
   * @param \Drupal\graphql\GraphQL\Execution\QueryVisitor\QueryVisitorInterface $visitor
   *
   * @return \Generator
   */
  protected function walkQuery(AbstractAst $node, FieldInterface $current, QueryVisitorInterface $visitor) {
    $carry = $visitor->initial();

    if (!($node instanceof Field)) {
      /** @var \Youshido\GraphQL\Parser\Ast\Field $field */
      foreach ($node->getFields() as $field) {
abstract class User
{
    /** @return string */
    abstract public function getPassword();
}

class MyUser extends User
{
    public function getPassword()
    {
        // return something
    }

    public function getDisplayName()
    {
        // return some name.
    }
}

class AuthSystem
{
    public function authenticate(User $user)
    {
        $this->logger->info(sprintf('Authenticating %s.', $user->getDisplayName()));
        // do something.
    }
}
        if ($field instanceof FragmentInterface) {
          if ($field instanceof FragmentReference) {
            $field = $this->request->getFragment($field->getName());
          }

          $walker = $this->walkQuery($field, $current, $visitor);
/**
 * @return array|string
 */
function returnsDifferentValues($x) {
    if ($x) {
        return 'foo';
    }

    return array();
}

$x = returnsDifferentValues($y);
if (is_array($x)) {
    // $x is an array.
}
          $next = $walker->current();

          while ($walker->valid()) {

            $received = (yield $next);
            $carry = $visitor->reduce($carry, $received);
            $next = $walker->send($received);
          }
        }
        else {
          $type = $this->getType($node, $current);
          $name = $field->getName();

          if (($type instanceof AbstractObjectType || $type instanceof AbstractInterfaceType) && $type->hasField($name)) {
            $ast = $type->getField($name);
            $walker = $this->walkQuery($field, $ast, $visitor);
            $next = $walker->current();

            while ($walker->valid()) {

              $received = (yield $next);
              $carry = $visitor->reduce($carry, $received);
              $next = $walker->send($received);
            }
          }
        }
      }
    }

    if ($node instanceof Query || $node instanceof Field) {
      yield [$node, $current, $carry];
    }
  }

  /**
   * @param \Youshido\GraphQL\Parser\Ast\AbstractAst $node
   * @param \Youshido\GraphQL\Field\FieldInterface $current
   *
   * @return null|\Youshido\GraphQL\Type\AbstractType|\Youshido\GraphQL\Type\TypeInterface
   */
  protected function getType(AbstractAst $node, FieldInterface $current) {
    if ($node instanceof Fragment && $name = $node->getModel()) {
      return isset($this->types[$name]) ? $this->types[$name] : NULL;
    }

    if ($node instanceof TypedFragmentReference && $name = $node->getTypeName()) {
      return isset($this->types[$name]) ? $this->types[$name] : NULL;
    }

    return $current->getType()->getNamedType();
  }

}

1		<?php
2
3		namespace Drupal\graphql\GraphQL\Execution;
4
5		use Drupal\graphql\GraphQL\Execution\QueryVisitor\QueryVisitorInterface;
6		use Drupal\graphql\GraphQL\Utility\TypeCollector;
7		use Youshido\GraphQL\Execution\Request;
8		use Youshido\GraphQL\Field\FieldInterface;
9		use Youshido\GraphQL\Parser\Ast\AbstractAst;
10		use Youshido\GraphQL\Parser\Ast\Field;
11		use Youshido\GraphQL\Parser\Ast\Fragment;
12		use Youshido\GraphQL\Parser\Ast\FragmentReference;
13		use Youshido\GraphQL\Parser\Ast\Interfaces\FragmentInterface;
14		use Youshido\GraphQL\Parser\Ast\Mutation;
15		use Youshido\GraphQL\Parser\Ast\Query;
16		use Youshido\GraphQL\Parser\Ast\TypedFragmentReference;
17		use Youshido\GraphQL\Schema\AbstractSchema;
18		use Youshido\GraphQL\Type\InterfaceType\AbstractInterfaceType;
19		use Youshido\GraphQL\Type\Object\AbstractObjectType;
20
21		class QueryReducer {
22
23		/**
24		* @var \Youshido\GraphQL\Execution\Request
25		*/
26		protected $request;
27
28		/**
29		* @var \Youshido\GraphQL\Schema\AbstractSchema
30		*/
31		protected $schema;
32
33		/**
34		* @var \Youshido\GraphQL\Type\TypeInterface[]
35		*/
36		protected $types;
37
38		/**
39		* QueryReducer constructor.
40		*
41		* @param \Youshido\GraphQL\Schema\AbstractSchema $schema
42		* @param \Youshido\GraphQL\Execution\Request $request
43		*/
44		public function __construct(AbstractSchema $schema, Request $request) {
45		$this->schema = $schema;
46		$this->request = $request;
47		$this->types = TypeCollector::collectTypes($schema);
48		}
49
50		/**
51		* @param \Drupal\graphql\GraphQL\Execution\QueryVisitor\QueryVisitorInterface $visitor
52		*
53		* @return mixed\|\Youshido\GraphQL\Parser\Ast\Query
54		*/
55		public function reduceQuery(QueryVisitorInterface $visitor) {
56		$operations = $this->request->getAllOperations();
57
58		return $visitor->finish(array_reduce($operations, function ($carry, $current) use ($visitor) {
59		$type = $current instanceof Mutation ? $this->schema->getMutationType() : $this->schema->getQueryType();
60		return $this->reduceOperation($current, $carry, $type, $visitor);
61		}, $visitor->initial()));
62		}
63
64		/**
65		* @param \Youshido\GraphQL\Parser\Ast\Query $query
66		* @param $carry
67		* @param $current
68		* @param \Drupal\graphql\GraphQL\Execution\QueryVisitor\QueryVisitorInterface $visitor
69		*
70		* @return mixed\|void
71		*/
72		protected function reduceOperation(Query $query, $carry, $current, QueryVisitorInterface $visitor) {
73		if (!($current instanceof AbstractObjectType) \|\| !$current->hasField($query->getName())) {
74		return;
75		}
76
77		if (($name = $query->getName()) && $current->hasField($name)) {
78		$operation = $current->getField($query->getName());
79		$walker = $this->walkQuery($query, $operation, $visitor);
80
81		while ($walker->valid()) {
82		/** @var \Youshido\GraphQL\Parser\Ast\Field $field */
83		/** @var \Youshido\GraphQL\Field\Field $ast */
84		list($field, $ast, $child) = $walker->current();
85
86		$args = $field->getKeyValueArguments();
87		$result = $visitor->visit($args, $ast, $child);
88		$carry = $visitor->reduce($carry, $result);
89
90		$walker->send($result);
91		}
92		}
93
94		return $carry;
95		}
96
97		/**
98		* @param $node
99		* @param \Youshido\GraphQL\Field\FieldInterface $current
100		* @param \Drupal\graphql\GraphQL\Execution\QueryVisitor\QueryVisitorInterface $visitor
101		*
102		* @return \Generator
103		*/
104		protected function walkQuery(AbstractAst $node, FieldInterface $current, QueryVisitorInterface $visitor) {
105		$carry = $visitor->initial();
106
107		if (!($node instanceof Field)) {
108		/** @var \Youshido\GraphQL\Parser\Ast\Field $field */
109		foreach ($node->getFields() as $field) {
		0 ignored issues – show Bug introduced 2018-02-13 23:10 UTC by Report Bug Copy Issue Report It seems like you code against a specific sub-type and not the parent class `Youshido\GraphQL\Parser\Ast\AbstractAst` as the method `getFields()` does only exist in the following sub-classes of `Youshido\GraphQL\Parser\Ast\AbstractAst`: `Youshido\GraphQL\Parser\Ast\Field`, `Youshido\GraphQL\Parser\Ast\Fragment`, `Youshido\GraphQL\Parser\Ast\Mutation`, `Youshido\GraphQL\Parser\Ast\Query`, `Youshido\GraphQL\Parser\Ast\TypedFragmentReference`. Maybe you want to `instanceof` check for one of these explicitly? Let’s take a look at an example: abstract class User { /** @return string / abstract public function getPassword(); } class MyUser extends User { public function getPassword() { // return something } public function getDisplayName() { // return some name. } } class AuthSystem { public function authenticate(User $user) { $this->logger->info(sprintf('Authenticating %s.', $user->getDisplayName())); // do something. } } In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different sub-classes of User which does not have a getDisplayName() method, the code will break. Available Fixes Change the type-hint for the parameter: class AuthSystem { public function authenticate(MyUser $user) { / ... / } } Add an additional type-check: class AuthSystem { public function authenticate(User $user) { if ($user instanceof MyUser) { $this->logger->info(/* ... /); } // or alternatively if ( ! $user instanceof MyUser) { throw new \LogicException( '$user must be an instance of MyUser, ' .'other instances are not supported.' ); } } } Note:* PHP Analyzer uses reverse abstract interpretation to narrow down the types inside the if block in such a case. Add the method to the parent class: abstract class User { /** @return string / abstract public function getPassword(); /* @return string */ abstract public function getDisplayName(); } Loading history...
110		if ($field instanceof FragmentInterface) {
111		if ($field instanceof FragmentReference) {
112		$field = $this->request->getFragment($field->getName());
113		}
114
115		$walker = $this->walkQuery($field, $current, $visitor);
		0 ignored issues – show Bug introduced 2018-02-13 23:10 UTC by Report Bug Copy Issue Report It seems like `$field` defined by `$this->request->getFragment($field->getName())` on line `112` can also be of type `null` or `object<Youshido\GraphQL\...aces\FragmentInterface>`; however, `Drupal\graphql\GraphQL\E...eryReducer::walkQuery()` does only seem to accept `object<Youshido\GraphQL\Parser\Ast\AbstractAst>`, maybe add an additional type check? If a method or function can return multiple different values and unless you are sure that you only can receive a single value in this context, we recommend to add an additional type check: /** * @return array\|string */ function returnsDifferentValues($x) { if ($x) { return 'foo'; } return array(); } $x = returnsDifferentValues($y); if (is_array($x)) { // $x is an array. } If this a common case that PHP Analyzer should handle natively, please let us know by opening an issue. Loading history...
116		$next = $walker->current();
117
118	View Code Duplication	while ($walker->valid()) {
		0 ignored issues – show Duplication introduced 2018-02-13 23:10 UTC by Report Bug Copy Issue Report This code seems to be duplicated across your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
119		$received = (yield $next);
120		$carry = $visitor->reduce($carry, $received);
121		$next = $walker->send($received);
122		}
123		}
124		else {
125		$type = $this->getType($node, $current);
126		$name = $field->getName();
127
128		if (($type instanceof AbstractObjectType \|\| $type instanceof AbstractInterfaceType) && $type->hasField($name)) {
129		$ast = $type->getField($name);
130		$walker = $this->walkQuery($field, $ast, $visitor);
131		$next = $walker->current();
132
133	View Code Duplication	while ($walker->valid()) {
		0 ignored issues – show Duplication introduced 2018-02-13 23:10 UTC by Report Bug Copy Issue Report This code seems to be duplicated across your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
134		$received = (yield $next);
135		$carry = $visitor->reduce($carry, $received);
136		$next = $walker->send($received);
137		}
138		}
139		}
140		}
141		}
142
143		if ($node instanceof Query \|\| $node instanceof Field) {
144		yield [$node, $current, $carry];
145		}
146		}
147
148		/**
149		* @param \Youshido\GraphQL\Parser\Ast\AbstractAst $node
150		* @param \Youshido\GraphQL\Field\FieldInterface $current
151		*
152		* @return null\|\Youshido\GraphQL\Type\AbstractType\|\Youshido\GraphQL\Type\TypeInterface
153		*/
154		protected function getType(AbstractAst $node, FieldInterface $current) {
155		if ($node instanceof Fragment && $name = $node->getModel()) {
156		return isset($this->types[$name]) ? $this->types[$name] : NULL;
157		}
158
159		if ($node instanceof TypedFragmentReference && $name = $node->getTypeName()) {
160		return isset($this->types[$name]) ? $this->types[$name] : NULL;
161		}
162
163		return $current->getType()->getNamedType();
164		}
165
166		}

drupal-graphql / graphql

Pull Request — 8.x-3.x (#519)

QueryReducer::walkQuery() C

Complexity

Size

Duplication

Importance

How to fix Complexity

Long Method

Available Fixes

Duplication Side-by-Side

Filter issues like