rector/rules/Privatization/Rector/MethodCall/PrivatizeLocalGetterToPropertyRector.php

<?php

declare (strict_types=1);
namespace Rector\Privatization\Rector\MethodCall;

use PhpParser\Node;
use PhpParser\Node\Expr\MethodCall;
use PhpParser\Node\Expr\PropertyFetch;
use PhpParser\Node\Expr\Variable;
use PhpParser\Node\Stmt\Class_;
use PhpParser\Node\Stmt\ClassMethod;
use PhpParser\Node\Stmt\Return_;
use Rector\Core\Rector\AbstractRector;
use Rector\NodeTypeResolver\Node\AttributeKey;
use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;
/**
 * @see \Rector\Tests\Privatization\Rector\MethodCall\PrivatizeLocalGetterToPropertyRector\PrivatizeLocalGetterToPropertyRectorTest
 */
final class PrivatizeLocalGetterToPropertyRector extends \Rector\Core\Rector\AbstractRector
{
    public function getRuleDefinition() : \Symplify\RuleDocGenerator\ValueObject\RuleDefinition
    {
        return new \Symplify\RuleDocGenerator\ValueObject\RuleDefinition('Privatize getter of local property to property', [new \Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample(<<<'CODE_SAMPLE'
class SomeClass
{
    private $some;

    public function run()
    {
        return $this->getSome() + 5;
    }

    private function getSome()
    {
        return $this->some;
    }
}
CODE_SAMPLE
, <<<'CODE_SAMPLE'
class SomeClass
{
    private $some;

    public function run()
    {
        return $this->some + 5;
    }

    private function getSome()
    {
        return $this->some;
    }
}
CODE_SAMPLE
)]);
    }
    /**
     * @return array<class-string<Node>>
     */
    public function getNodeTypes() : array
    {
        return [\PhpParser\Node\Expr\MethodCall::class];
    }
    /**
     * @param MethodCall $node
     */
    public function refactor(\PhpParser\Node $node) : ?\PhpParser\Node
    {
        if (!$node->var instanceof \PhpParser\Node\Expr\Variable) {
            return null;
        }
        if (!$this->nodeNameResolver->isName($node->var, 'this')) {
            return null;
        }
        $classLike = $node->getAttribute(\Rector\NodeTypeResolver\Node\AttributeKey::CLASS_NODE);
        if (!$classLike instanceof \PhpParser\Node\Stmt\Class_) {
            return null;
        }
        $methodName = $this->getName($node->name);
        if ($methodName === null) {
            return null;
        }
        $classMethod = $classLike->getMethod($methodName);
        if (!$classMethod instanceof \PhpParser\Node\Stmt\ClassMethod) {
            return null;
        }
        return $this->matchLocalPropertyFetchInGetterMethod($classMethod);
    }
    private function matchLocalPropertyFetchInGetterMethod(\PhpParser\Node\Stmt\ClassMethod $classMethod) : ?\PhpParser\Node\Expr\PropertyFetch
    {
        $stmts = (array) $classMethod->stmts;
        if (\count($stmts) !== 1) {
            return null;
        }
        $onlyStmt = $stmts[0] ?? null;
        if (!$onlyStmt instanceof \PhpParser\Node\Stmt\Return_) {
            return null;
        }
        $returnedExpr = $onlyStmt->expr;
        if (!$returnedExpr instanceof \PhpParser\Node\Expr\PropertyFetch) {
            return null;
        }
        return $returnedExpr;
    }
}