anonymous//src/Rules/Exceptions/MustRethrowRule.php$0 - Code Metrics - Inspection of "Trust static method call" - thecodingmachine/phpstan-strict-rules - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#55)

unknown

created 2020-05-09 18:14 UTC

s/MustRethrowRule.php$0 A

↳ Parent: MustRethrowRule::processNode()

Complexity

Total Complexity

Size/Duplication

Total Lines	60
Duplicated Lines	0 %

Coupling/Cohesion

Components	1
Dependencies	2

Importance

Changes

Metric	Value
wmc	9
lcom	1
cbo	2
dl	0
loc	60
rs	10
c	0
b	0
f	0

<?php


namespace TheCodingMachine\PHPStan\Rules\Exceptions;

use Exception;
use function in_array;
use PhpParser\Node;
use PhpParser\NodeFinder;
use PhpParser\Node\Stmt\Catch_;
use PhpParser\NodeTraverser;
use PhpParser\NodeVisitorAbstract;
use PhpParser\Node\Expr\Variable;
use PhpParser\Node\Expr\StaticCall;
use PHPStan\Analyser\Scope;
use PHPStan\Broker\Broker;
use PHPStan\Rules\Rule;
use RuntimeException;
use TheCodingMachine\PHPStan\Utils\PrefixGenerator;
use Throwable;

/**
 * When catching \Exception, \RuntimeException or \Throwable, the exception MUST be thrown again
 * (unless you are developing an exception handler...)
 *
 * @implements Rule<Catch_>
 */
class MustRethrowRule implements Rule
{
    public function getNodeType(): string
    {
        return Catch_::class;
    }

    /**
     * @param Catch_ $node
     * @param \PHPStan\Analyser\Scope $scope
     * @return string[]
     */
    public function processNode(Node $node, Scope $scope): array
    {
        // Let's only apply the filter to \Exception, \RuntimeException or \Throwable
        $exceptionType = null;
        foreach ($node->types as $type) {
interface SomeInterface { }
class SomeClass implements SomeInterface {
    public $a;
}

function someFunction(SomeInterface $object) {
    if ($object instanceof SomeClass) {
        $a = $object->a;
    }
}
            if (in_array((string)$type, [Exception::class, RuntimeException::class, Throwable::class], true)) {
                $exceptionType = (string)$type;
                break;
            }
        }

        if ($exceptionType === null) {
            return [];
        }

        $exceptionVarName = $node->var->name;
interface SomeInterface { }
class SomeClass implements SomeInterface {
    public $a;
}

function someFunction(SomeInterface $object) {
    if ($object instanceof SomeClass) {
        $a = $object->a;
    }
}

        // Let's visit and find a throw.
        $visitor = new class($exceptionVarName)  extends NodeVisitorAbstract {
            /**
             * @var bool
             */
            private $throwFound = false;

            /**
             * @var bool
             */
            private $throwFoundProbably = false;

            private $exceptionVarName;

            public function __construct(string $exceptionVarName)
            {
                $this->exceptionVarName = $exceptionVarName;
            }

            public function leaveNode(Node $node)
            {
                // Only rethrow through static methods are allowed
                if ($node instanceof StaticCall) {
                    $this->throwFoundProbably = $this->isProbablyAThrow($node);
                }

                if ($node instanceof Node\Stmt\Throw_) {
                    $this->throwFound = true;
                }
                return null;
            }

            /**
             * @return bool
             */
            public function isThrowFound(): bool
            {
                return $this->throwFound;
            }

            /**
             * @return bool
             */
            public function isThrowProbablyFound(): bool
            {
                return $this->throwFoundProbably;
            }

            private function isProbablyAThrow(Node $node)
            {
                if (!$args = $node->args) {
interface SomeInterface { }
class SomeClass implements SomeInterface {
    public $a;
}

function someFunction(SomeInterface $object) {
    if ($object instanceof SomeClass) {
        $a = $object->a;
    }
}
                    return false;
                }

                $varArgs = array_filter($args, function ($arg) {
                    return $arg->value instanceof Variable && $arg->value->name === $this->exceptionVarName ;
                });

                return 0 !== count($varArgs);
            }
        };

        $traverser = new NodeTraverser();

        $traverser->addVisitor($visitor);

        $traverser->traverse($node->stmts);
interface SomeInterface { }
class SomeClass implements SomeInterface {
    public $a;
}

function someFunction(SomeInterface $object) {
    if ($object instanceof SomeClass) {
        $a = $object->a;
    }
}

        $errors = [];

        if (!$visitor->isThrowFound() && !$visitor->isThrowProbablyFound()) {
            $errors[] = sprintf('%scaught "%s" must be rethrown. Either catch a more specific exception or add a "throw" clause in the "catch" block to propagate the exception. More info: http://bit.ly/failloud', PrefixGenerator::generatePrefix($scope), $exceptionType);
        }

        return $errors;
    }
}


1			<?php
2
3
4			namespace TheCodingMachine\PHPStan\Rules\Exceptions;
5
6			use Exception;
7			use function in_array;
8			use PhpParser\Node;
9			use PhpParser\NodeFinder;
10			use PhpParser\Node\Stmt\Catch_;
11			use PhpParser\NodeTraverser;
12			use PhpParser\NodeVisitorAbstract;
13			use PhpParser\Node\Expr\Variable;
14			use PhpParser\Node\Expr\StaticCall;
15			use PHPStan\Analyser\Scope;
16			use PHPStan\Broker\Broker;
17			use PHPStan\Rules\Rule;
18			use RuntimeException;
19			use TheCodingMachine\PHPStan\Utils\PrefixGenerator;
20			use Throwable;
21
22			/**
23			* When catching \Exception, \RuntimeException or \Throwable, the exception MUST be thrown again
24			* (unless you are developing an exception handler...)
25			*
26			* @implements Rule<Catch_>
27			*/
28			class MustRethrowRule implements Rule
29			{
30			public function getNodeType(): string
31			{
32			return Catch_::class;
33			}
34
35			/**
36			* @param Catch_ $node
37			* @param \PHPStan\Analyser\Scope $scope
38			* @return string[]
39			*/
40			public function processNode(Node $node, Scope $scope): array
41			{
42			// Let's only apply the filter to \Exception, \RuntimeException or \Throwable
43			$exceptionType = null;
44			foreach ($node->types as $type) {
			0 ignored issues – show Bug introduced 2018-11-20 16:44 UTC by Report Bug Copy Issue Report Accessing `types` on the interface `PhpParser\Node` suggest that you code against a concrete implementation. How about adding an `instanceof` check? If you access a property on an interface, you most likely code against a concrete implementation of the interface. Available Fixes Adding an additional type check: interface SomeInterface { } class SomeClass implements SomeInterface { public $a; } function someFunction(SomeInterface $object) { if ($object instanceof SomeClass) { $a = $object->a; } } Changing the type hint: interface SomeInterface { } class SomeClass implements SomeInterface { public $a; } function someFunction(SomeClass $object) { $a = $object->a; } Loading history...
45			if (in_array((string)$type, [Exception::class, RuntimeException::class, Throwable::class], true)) {
46			$exceptionType = (string)$type;
47			break;
48			}
49			}
50
51			if ($exceptionType === null) {
52			return [];
53			}
54
55			$exceptionVarName = $node->var->name;
			0 ignored issues – show Bug introduced 2020-05-09 18:16 UTC by Report Bug Copy Issue Report Accessing `var` on the interface `PhpParser\Node` suggest that you code against a concrete implementation. How about adding an `instanceof` check? If you access a property on an interface, you most likely code against a concrete implementation of the interface. Available Fixes Adding an additional type check: interface SomeInterface { } class SomeClass implements SomeInterface { public $a; } function someFunction(SomeInterface $object) { if ($object instanceof SomeClass) { $a = $object->a; } } Changing the type hint: interface SomeInterface { } class SomeClass implements SomeInterface { public $a; } function someFunction(SomeClass $object) { $a = $object->a; } Loading history...
56
57			// Let's visit and find a throw.
58			$visitor = new class($exceptionVarName) extends NodeVisitorAbstract {
59			/**
60			* @var bool
61			*/
62			private $throwFound = false;
63
64			/**
65			* @var bool
66			*/
67			private $throwFoundProbably = false;
68
69			private $exceptionVarName;
70
71			public function __construct(string $exceptionVarName)
72			{
73			$this->exceptionVarName = $exceptionVarName;
74			}
75
76			public function leaveNode(Node $node)
77			{
78			// Only rethrow through static methods are allowed
79			if ($node instanceof StaticCall) {
80			$this->throwFoundProbably = $this->isProbablyAThrow($node);
81			}
82
83			if ($node instanceof Node\Stmt\Throw_) {
84			$this->throwFound = true;
85			}
86			return null;
87			}
88
89			/**
90			* @return bool
91			*/
92			public function isThrowFound(): bool
93			{
94			return $this->throwFound;
95			}
96
97			/**
98			* @return bool
99			*/
100			public function isThrowProbablyFound(): bool
101			{
102			return $this->throwFoundProbably;
103			}
104
105			private function isProbablyAThrow(Node $node)
106			{
107			if (!$args = $node->args) {
			0 ignored issues – show Bug introduced 2020-05-09 18:16 UTC by Report Bug Copy Issue Report Accessing `args` on the interface `PhpParser\Node` suggest that you code against a concrete implementation. How about adding an `instanceof` check? If you access a property on an interface, you most likely code against a concrete implementation of the interface. Available Fixes Adding an additional type check: interface SomeInterface { } class SomeClass implements SomeInterface { public $a; } function someFunction(SomeInterface $object) { if ($object instanceof SomeClass) { $a = $object->a; } } Changing the type hint: interface SomeInterface { } class SomeClass implements SomeInterface { public $a; } function someFunction(SomeClass $object) { $a = $object->a; } Loading history...
108			return false;
109			}
110
111			$varArgs = array_filter($args, function ($arg) {
112			return $arg->value instanceof Variable && $arg->value->name === $this->exceptionVarName ;
113			});
114
115			return 0 !== count($varArgs);
116			}
117			};
118
119			$traverser = new NodeTraverser();
120
121			$traverser->addVisitor($visitor);
122
123			$traverser->traverse($node->stmts);
			0 ignored issues – show Bug introduced 2017-06-27 16:04 UTC by Report Bug Copy Issue Report Accessing `stmts` on the interface `PhpParser\Node` suggest that you code against a concrete implementation. How about adding an `instanceof` check? If you access a property on an interface, you most likely code against a concrete implementation of the interface. Available Fixes Adding an additional type check: interface SomeInterface { } class SomeClass implements SomeInterface { public $a; } function someFunction(SomeInterface $object) { if ($object instanceof SomeClass) { $a = $object->a; } } Changing the type hint: interface SomeInterface { } class SomeClass implements SomeInterface { public $a; } function someFunction(SomeClass $object) { $a = $object->a; } Loading history...
124
125			$errors = [];
126
127			if (!$visitor->isThrowFound() && !$visitor->isThrowProbablyFound()) {
128			$errors[] = sprintf('%scaught "%s" must be rethrown. Either catch a more specific exception or add a "throw" clause in the "catch" block to propagate the exception. More info: http://bit.ly/failloud', PrefixGenerator::generatePrefix($scope), $exceptionType);
129			}
130
131			return $errors;
132			}
133			}
134

thecodingmachine / phpstan-strict-rules

Pull Request — master (#55)

s/MustRethrowRule.php$0 A

Complexity

Size/Duplication

Coupling/Cohesion

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