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Edit File: WritingToReadOnlyPropertiesRule.php

<?php declare(strict_types = 1);

namespace PHPStan\Rules\Properties;

use PhpParser\Node;
use PHPStan\Analyser\Scope;
use PHPStan\Rules\RuleLevelHelper;

class WritingToReadOnlyPropertiesRule implements \PHPStan\Rules\Rule
{

/** @var \PHPStan\Rules\RuleLevelHelper */
	private $ruleLevelHelper;

/** @var \PHPStan\Rules\Properties\PropertyDescriptor */
	private $propertyDescriptor;

/** @var \PHPStan\Rules\Properties\PropertyReflectionFinder */
	private $propertyReflectionFinder;

/** @var bool */
	private $checkThisOnly;

public function __construct(
		RuleLevelHelper $ruleLevelHelper,
		PropertyDescriptor $propertyDescriptor,
		PropertyReflectionFinder $propertyReflectionFinder,
		bool $checkThisOnly
	)
	{
		$this->ruleLevelHelper = $ruleLevelHelper;
		$this->propertyDescriptor = $propertyDescriptor;
		$this->propertyReflectionFinder = $propertyReflectionFinder;
		$this->checkThisOnly = $checkThisOnly;
	}

public function getNodeType(): string
	{
		return \PhpParser\Node\Expr::class;
	}

/**
	 * @param \PhpParser\Node\Expr $node
	 * @param \PHPStan\Analyser\Scope $scope
	 * @return string[]
	 */
	public function processNode(Node $node, Scope $scope): array
	{
		if (
			!$node instanceof Node\Expr\Assign
			&& !$node instanceof Node\Expr\AssignOp
		) {
			return [];
		}

if (
			!($node->var instanceof Node\Expr\PropertyFetch)
			&& !($node->var instanceof Node\Expr\StaticPropertyFetch)
		) {
			return [];
		}

if (
			$node->var instanceof Node\Expr\PropertyFetch
			&& $this->checkThisOnly
			&& !$this->ruleLevelHelper->isThis($node->var->var)
		) {
			return [];
		}

/** @var \PhpParser\Node\Expr\PropertyFetch|\PhpParser\Node\Expr\StaticPropertyFetch $propertyFetch */
		$propertyFetch = $node->var;
		$propertyReflection = $this->propertyReflectionFinder->findPropertyReflectionFromNode($propertyFetch, $scope);
		if ($propertyReflection === null) {
			return [];
		}

if (!$scope->canAccessProperty($propertyReflection)) {
			return [];
		}

if (!$propertyReflection->isWritable()) {
			$propertyDescription = $this->propertyDescriptor->describeProperty($propertyReflection, $propertyFetch);

return [
				sprintf(
					'%s is not writable.',
					$propertyDescription
				),
			];
		}

return [];
	}

}