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Edit File: BooleanNotConstantConditionRule.php

<?php declare(strict_types = 1);

namespace PHPStan\Rules\Comparison;

use PHPStan\Rules\RuleError;
use PHPStan\Rules\RuleErrorBuilder;
use PHPStan\Type\Constant\ConstantBooleanType;

class BooleanNotConstantConditionRule implements \PHPStan\Rules\Rule
{

/** @var ConstantConditionRuleHelper */
	private $helper;

public function __construct(
		ConstantConditionRuleHelper $helper
	)
	{
		$this->helper = $helper;
	}

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

/**
	 * @param \PhpParser\Node\Expr\BooleanNot $node
	 * @param \PHPStan\Analyser\Scope $scope
	 * @return RuleError[]
	 */
	public function processNode(
		\PhpParser\Node $node,
		\PHPStan\Analyser\Scope $scope
	): array
	{
		$exprType = $this->helper->getBooleanType($scope, $node->expr);
		if ($exprType instanceof ConstantBooleanType) {
			return [
				RuleErrorBuilder::message(sprintf(
					'Negated boolean expression is always %s.',
					$exprType->getValue() ? 'false' : 'true'
				))->line($node->expr->getLine())->build(),
			];
		}

return [];
	}

}