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<?php declare (strict_types=1); namespace Rector\Privatization\Rector\Class_; use PhpParser\Node; use PhpParser\Node\Expr\Assign; use PhpParser\Node\Expr\PropertyFetch; use PhpParser\Node\Expr\Variable; use PhpParser\Node\Stmt\Class_; use PhpParser\Node\Stmt\ClassMethod; use PhpParser\Node\Stmt\Global_; use PhpParser\NodeTraverser; use Rector\Core\Rector\AbstractRector; use Rector\PostRector\Collector\PropertyToAddCollector; use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample; use Symplify\RuleDocGenerator\ValueObject\RuleDefinition; /** * @changelog https://3v4l.org/DWC4P * * @changelog https://stackoverflow.com/a/12446305/1348344 * @see \Rector\Tests\Privatization\Rector\Class_\ChangeGlobalVariablesToPropertiesRector\ChangeGlobalVariablesToPropertiesRectorTest */ final class ChangeGlobalVariablesToPropertiesRector extends AbstractRector { /** * @var string[] */ private $globalVariableNames = []; /** * @readonly * @var \Rector\PostRector\Collector\PropertyToAddCollector */ private $propertyToAddCollector; public function __construct(PropertyToAddCollector $propertyToAddCollector) { $this->propertyToAddCollector = $propertyToAddCollector; } public function getRuleDefinition() : RuleDefinition { return new RuleDefinition('Change global $variables to private properties', [new CodeSample(<<<'CODE_SAMPLE' class SomeClass { public function go() { global $variable; $variable = 5; } public function run() { global $variable; var_dump($variable); } } CODE_SAMPLE , <<<'CODE_SAMPLE' class SomeClass { private $variable; public function go() { $this->variable = 5; } public function run() { var_dump($this->variable); } } CODE_SAMPLE )]); } /** * @return array<class-string<Node>> */ public function getNodeTypes() : array { return [Class_::class]; } /** * @param Class_ $node */ public function refactor(Node $node) : ?Node { foreach ($node->getMethods() as $classMethod) { $this->collectGlobalVariableNamesAndRefactorToPropertyFetch($node, $classMethod); } if ($this->globalVariableNames === []) { return null; } foreach ($this->globalVariableNames as $globalVariableName) { $this->propertyToAddCollector->addPropertyWithoutConstructorToClass($globalVariableName, null, $node); } return $node; } private function collectGlobalVariableNamesAndRefactorToPropertyFetch(Class_ $class, ClassMethod $classMethod) : void { $this->globalVariableNames = []; $this->traverseNodesWithCallable($classMethod, function (Node $node) use($class) { if ($node instanceof Global_) { $this->refactorGlobal($class, $node); return NodeTraverser::DONT_TRAVERSE_CHILDREN; } if ($node instanceof Variable) { return $this->refactorGlobalVariable($node); } return null; }); } private function refactorGlobal(Class_ $class, Global_ $global) : void { foreach ($global->vars as $var) { $varName = $this->getName($var); if ($varName === null) { return; } if ($this->isReadOnly($class, $varName)) { return; } $this->globalVariableNames[] = $varName; } $this->removeNode($global); } private function refactorGlobalVariable(Variable $variable) : ?PropertyFetch { if (!$this->isNames($variable, $this->globalVariableNames)) { return null; } // replace with property fetch $variableName = $this->getName($variable); if ($variableName === null) { return null; } return $this->nodeFactory->createPropertyFetch('this', $variableName); } private function isReadOnly(Class_ $class, string $globalVariableName) : bool { /** @var ClassMethod[] $classMethods */ $classMethods = $this->betterNodeFinder->findInstanceOf($class, ClassMethod::class); foreach ($classMethods as $classMethod) { $isReAssign = (bool) $this->betterNodeFinder->findFirst((array) $classMethod->stmts, function (Node $node) use($globalVariableName) : bool { if (!$node instanceof Assign) { return \false; } if ($node->var instanceof Variable) { return $this->nodeNameResolver->isName($node->var, $globalVariableName); } if ($node->var instanceof PropertyFetch) { return $this->nodeNameResolver->isName($node->var, $globalVariableName); } return \false; }); if ($isReAssign) { return \false; } } return \true; } }
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