mirror of https://github.com/rectorphp/rector.git
175 lines
5.6 KiB
PHP
175 lines
5.6 KiB
PHP
<?php
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declare (strict_types=1);
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namespace Rector\Php71\Rector\Assign;
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use PhpParser\Node;
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use PhpParser\Node\Expr;
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use PhpParser\Node\Expr\Array_;
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use PhpParser\Node\Expr\ArrayDimFetch;
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use PhpParser\Node\Expr\Assign;
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use PhpParser\Node\Expr\Variable;
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use PhpParser\Node\Scalar\String_;
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use PhpParser\Node\Stmt;
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use PhpParser\Node\Stmt\Class_;
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use PhpParser\Node\Stmt\ClassMethod;
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use PhpParser\Node\Stmt\Function_;
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use PhpParser\Node\Stmt\Namespace_;
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use PhpParser\Node\Stmt\Property;
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use Rector\Core\PhpParser\NodeFinder\PropertyFetchFinder;
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use Rector\Core\Rector\AbstractRector;
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use Rector\Core\ValueObject\PhpVersionFeature;
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use Rector\VersionBonding\Contract\MinPhpVersionInterface;
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use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
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use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;
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/**
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* @changelog https://stackoverflow.com/a/41000866/1348344 https://3v4l.org/ABDNv
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*
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* @see \Rector\Tests\Php71\Rector\Assign\AssignArrayToStringRector\AssignArrayToStringRectorTest
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*/
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final class AssignArrayToStringRector extends AbstractRector implements MinPhpVersionInterface
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{
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/**
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* @readonly
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* @var \Rector\Core\PhpParser\NodeFinder\PropertyFetchFinder
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*/
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private $propertyFetchFinder;
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public function __construct(PropertyFetchFinder $propertyFetchFinder)
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{
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$this->propertyFetchFinder = $propertyFetchFinder;
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}
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public function provideMinPhpVersion() : int
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{
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return PhpVersionFeature::NO_ASSIGN_ARRAY_TO_STRING;
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}
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public function getRuleDefinition() : RuleDefinition
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{
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return new RuleDefinition('String cannot be turned into array by assignment anymore', [new CodeSample(<<<'CODE_SAMPLE'
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$string = '';
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$string[] = 1;
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CODE_SAMPLE
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, <<<'CODE_SAMPLE'
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$string = [];
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$string[] = 1;
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CODE_SAMPLE
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)]);
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}
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/**
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* @return array<class-string<Node>>
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*/
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public function getNodeTypes() : array
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{
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return [Assign::class, Class_::class];
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}
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/**
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* @param Assign|Class_ $node
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*/
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public function refactor(Node $node) : ?Node
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{
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if ($node instanceof Class_) {
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return $this->refactorClass($node);
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}
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return $this->refactorAssign($node);
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}
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private function isEmptyString(Expr $expr) : bool
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{
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if (!$expr instanceof String_) {
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return \false;
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}
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return $expr->value === '';
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}
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private function refactorClass(Class_ $class) : ?Class_
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{
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$hasChanged = \false;
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foreach ($class->getProperties() as $property) {
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if (!$this->hasPropertyDefaultEmptyString($property)) {
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continue;
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}
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$arrayDimFetches = $this->propertyFetchFinder->findLocalPropertyArrayDimFetchesAssignsByName($class, $property);
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foreach ($arrayDimFetches as $arrayDimFetch) {
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if ($arrayDimFetch->dim instanceof Expr) {
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continue;
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}
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$property->props[0]->default = new Array_();
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$hasChanged = \true;
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}
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}
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if ($hasChanged) {
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return $class;
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}
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return null;
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}
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private function hasPropertyDefaultEmptyString(Property $property) : bool
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{
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$defaultExpr = $property->props[0]->default;
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if (!$defaultExpr instanceof Expr) {
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return \false;
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}
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return $this->isEmptyString($defaultExpr);
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}
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/**
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* @return ArrayDimFetch[]
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*/
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private function findSameNamedVariableAssigns(Variable $variable) : array
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{
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// assign of empty string to something
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$scopeStmt = $this->findParentScope($variable);
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if (!$scopeStmt instanceof Stmt) {
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return [];
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}
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$variableName = $this->nodeNameResolver->getName($variable);
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if ($variableName === null) {
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return [];
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}
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$assignedArrayDimFetches = [];
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$this->traverseNodesWithCallable($scopeStmt, function (Node $node) use($variableName, &$assignedArrayDimFetches) {
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if (!$node instanceof Assign) {
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return null;
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}
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if (!$node->var instanceof ArrayDimFetch) {
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return null;
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}
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$arrayDimFetch = $node->var;
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if (!$arrayDimFetch->var instanceof Variable) {
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return null;
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}
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if (!$this->isName($arrayDimFetch->var, $variableName)) {
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return null;
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}
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$assignedArrayDimFetches[] = $arrayDimFetch;
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});
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return $assignedArrayDimFetches;
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}
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/**
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* @return Function_|ClassMethod|Class_|Namespace_|null
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*/
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private function findParentScope(Variable $variable)
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{
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return $this->betterNodeFinder->findParentByTypes($variable, [Function_::class, ClassMethod::class, Class_::class, Namespace_::class]);
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}
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private function refactorAssign(Assign $assign) : ?Assign
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{
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if (!$this->isEmptyString($assign->expr)) {
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return null;
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}
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if (!$assign->var instanceof Variable) {
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return null;
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}
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$variableAssignArrayDimFetches = $this->findSameNamedVariableAssigns($assign->var);
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$shouldRetype = \false;
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// detect if is part of variable assign?
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foreach ($variableAssignArrayDimFetches as $variableAssignArrayDimFetch) {
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if ($variableAssignArrayDimFetch->dim instanceof Expr) {
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continue;
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}
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$shouldRetype = \true;
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break;
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}
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if (!$shouldRetype) {
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return null;
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}
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$assign->expr = new Array_();
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return $assign;
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}
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}
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