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4be28bf7eb
37b06023b6
[DeadCode] Fix removal of variable-used promoted property (#593)
116 lines
4.6 KiB
PHP
116 lines
4.6 KiB
PHP
<?php
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declare (strict_types=1);
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namespace Rector\Php72\Rector\Assign;
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use PhpParser\Node;
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use PhpParser\Node\Expr\ArrayItem;
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use PhpParser\Node\Expr\Assign;
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use PhpParser\Node\Expr\FuncCall;
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use PhpParser\Node\Expr\List_;
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use PhpParser\Node\Stmt\Expression;
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use Rector\Core\Exception\ShouldNotHappenException;
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use Rector\Core\NodeManipulator\AssignManipulator;
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use Rector\Core\Rector\AbstractRector;
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use Rector\NodeTypeResolver\Node\AttributeKey;
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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://wiki.php.net/rfc/deprecations_php_7_2#each
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*
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* @see \Rector\Tests\Php72\Rector\Assign\ListEachRector\ListEachRectorTest
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*/
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final class ListEachRector extends \Rector\Core\Rector\AbstractRector
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{
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/**
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* @var \Rector\Core\NodeManipulator\AssignManipulator
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*/
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private $assignManipulator;
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public function __construct(\Rector\Core\NodeManipulator\AssignManipulator $assignManipulator)
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{
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$this->assignManipulator = $assignManipulator;
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}
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public function getRuleDefinition() : \Symplify\RuleDocGenerator\ValueObject\RuleDefinition
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{
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return new \Symplify\RuleDocGenerator\ValueObject\RuleDefinition('each() function is deprecated, use key() and current() instead', [new \Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample(<<<'CODE_SAMPLE'
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list($key, $callback) = each($callbacks);
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CODE_SAMPLE
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, <<<'CODE_SAMPLE'
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$key = key($callbacks);
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$callback = current($callbacks);
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next($callbacks);
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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 [\PhpParser\Node\Expr\Assign::class];
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}
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/**
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* @param Assign $node
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*/
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public function refactor(\PhpParser\Node $node) : ?\PhpParser\Node
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{
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if ($this->shouldSkip($node)) {
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return null;
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}
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/** @var List_ $listNode */
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$listNode = $node->var;
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/** @var FuncCall $eachFuncCall */
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$eachFuncCall = $node->expr;
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// only key: list($key, ) = each($values);
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if ($listNode->items[0] && $listNode->items[1] === null) {
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$keyFuncCall = $this->nodeFactory->createFuncCall('key', $eachFuncCall->args);
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return new \PhpParser\Node\Expr\Assign($listNode->items[0]->value, $keyFuncCall);
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}
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// only value: list(, $value) = each($values);
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if ($listNode->items[1] && $listNode->items[0] === null) {
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$nextFuncCall = $this->nodeFactory->createFuncCall('next', $eachFuncCall->args);
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$this->addNodeAfterNode($nextFuncCall, $node);
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$currentFuncCall = $this->nodeFactory->createFuncCall('current', $eachFuncCall->args);
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$secondArrayItem = $listNode->items[1];
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return new \PhpParser\Node\Expr\Assign($secondArrayItem->value, $currentFuncCall);
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}
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// both: list($key, $value) = each($values);
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$currentFuncCall = $this->nodeFactory->createFuncCall('current', $eachFuncCall->args);
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$secondArrayItem = $listNode->items[1];
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if (!$secondArrayItem instanceof \PhpParser\Node\Expr\ArrayItem) {
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throw new \Rector\Core\Exception\ShouldNotHappenException();
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}
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$assign = new \PhpParser\Node\Expr\Assign($secondArrayItem->value, $currentFuncCall);
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$this->addNodeAfterNode($assign, $node);
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$nextFuncCall = $this->nodeFactory->createFuncCall('next', $eachFuncCall->args);
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$this->addNodeAfterNode($nextFuncCall, $node);
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$keyFuncCall = $this->nodeFactory->createFuncCall('key', $eachFuncCall->args);
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$firstArrayItem = $listNode->items[0];
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if (!$firstArrayItem instanceof \PhpParser\Node\Expr\ArrayItem) {
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throw new \Rector\Core\Exception\ShouldNotHappenException();
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}
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return new \PhpParser\Node\Expr\Assign($firstArrayItem->value, $keyFuncCall);
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}
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private function shouldSkip(\PhpParser\Node\Expr\Assign $assign) : bool
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{
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if (!$this->assignManipulator->isListToEachAssign($assign)) {
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return \true;
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}
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// assign should be top level, e.g. not in a while loop
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$parentNode = $assign->getAttribute(\Rector\NodeTypeResolver\Node\AttributeKey::PARENT_NODE);
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if (!$parentNode instanceof \PhpParser\Node\Stmt\Expression) {
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return \true;
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}
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/** @var List_ $listNode */
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$listNode = $assign->var;
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if (\count($listNode->items) !== 2) {
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return \true;
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}
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// empty list → cannot handle
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if ($listNode->items[0] !== null) {
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return \false;
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}
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return $listNode->items[1] === null;
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}
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}
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