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Edit File: ExistingNamesInUseRule.php

<?php declare(strict_types = 1);

namespace PHPStan\Rules\Namespaces;

use PhpParser\Node;
use PHPStan\Analyser\Scope;
use PHPStan\Broker\Broker;
use PHPStan\Rules\ClassCaseSensitivityCheck;
use PHPStan\Rules\ClassNameNodePair;
use PHPStan\Rules\RuleError;
use PHPStan\Rules\RuleErrorBuilder;

class ExistingNamesInUseRule implements \PHPStan\Rules\Rule
{

/** @var \PHPStan\Broker\Broker */
	private $broker;

/** @var \PHPStan\Rules\ClassCaseSensitivityCheck */
	private $classCaseSensitivityCheck;

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

public function __construct(
		Broker $broker,
		ClassCaseSensitivityCheck $classCaseSensitivityCheck,
		bool $checkFunctionNameCase
	)
	{
		$this->broker = $broker;
		$this->classCaseSensitivityCheck = $classCaseSensitivityCheck;
		$this->checkFunctionNameCase = $checkFunctionNameCase;
	}

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

/**
	 * @param \PhpParser\Node\Stmt\Use_ $node
	 * @param \PHPStan\Analyser\Scope $scope
	 * @return RuleError[]
	 */
	public function processNode(Node $node, Scope $scope): array
	{
		if ($node->type === Node\Stmt\Use_::TYPE_UNKNOWN) {
			throw new \PHPStan\ShouldNotHappenException();
		}

foreach ($node->uses as $use) {
			if ($use->type !== Node\Stmt\Use_::TYPE_UNKNOWN) {
				throw new \PHPStan\ShouldNotHappenException();
			}
		}

if ($node->type === Node\Stmt\Use_::TYPE_CONSTANT) {
			return $this->checkConstants($node->uses);
		}

if ($node->type === Node\Stmt\Use_::TYPE_FUNCTION) {
			return $this->checkFunctions($node->uses);
		}

return $this->checkClasses($node->uses);
	}

/**
	 * @param \PhpParser\Node\Stmt\UseUse[] $uses
	 * @return RuleError[]
	 */
	private function checkConstants(array $uses): array
	{
		$errors = [];
		foreach ($uses as $use) {
			if ($this->broker->hasConstant($use->name, null)) {
				continue;
			}

$errors[] = RuleErrorBuilder::message(sprintf('Used constant %s not found.', (string) $use->name))->line($use->name->getLine())->build();
		}

return $errors;
	}

/**
	 * @param \PhpParser\Node\Stmt\UseUse[] $uses
	 * @return RuleError[]
	 */
	private function checkFunctions(array $uses): array
	{
		$errors = [];
		foreach ($uses as $use) {
			if (!$this->broker->hasFunction($use->name, null)) {
				$errors[] = RuleErrorBuilder::message(sprintf('Used function %s not found.', (string) $use->name))->line($use->name->getLine())->build();
			} elseif ($this->checkFunctionNameCase) {
				$functionReflection = $this->broker->getFunction($use->name, null);
				$realName = $functionReflection->getName();
				$usedName = (string) $use->name;
				if (
					strtolower($realName) === strtolower($usedName)
					&& $realName !== $usedName
				) {
					$errors[] = RuleErrorBuilder::message(sprintf(
						'Function %s used with incorrect case: %s.',
						$realName,
						$usedName
					))->line($use->name->getLine())->build();
				}
			}
		}

return $errors;
	}

/**
	 * @param \PhpParser\Node\Stmt\UseUse[] $uses
	 * @return RuleError[]
	 */
	private function checkClasses(array $uses): array
	{
		return $this->classCaseSensitivityCheck->checkClassNames(
			array_map(static function (\PhpParser\Node\Stmt\UseUse $use): ClassNameNodePair {
				return new ClassNameNodePair((string) $use->name, $use->name);
			}, $uses)
		);
	}

}