mirror of
https://github.com/rectorphp/rector.git
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199 lines
5.7 KiB
PHP
199 lines
5.7 KiB
PHP
<?php
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declare(strict_types=1);
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namespace Rector\CodeQuality\Rector\Foreach_;
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use PhpParser\Node;
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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\BinaryOp\Coalesce;
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use PhpParser\Node\Expr\BinaryOp\Identical;
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use PhpParser\Node\Stmt\Expression;
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use PhpParser\Node\Stmt\Foreach_;
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use PhpParser\Node\Stmt\If_;
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use PhpParser\Node\Stmt\Return_;
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use Rector\Core\NodeManipulator\ForeachManipulator;
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use Rector\Core\Rector\AbstractRector;
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use Rector\Core\ValueObject\PhpVersionFeature;
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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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* @see https://3v4l.org/bfsdY
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*
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* @see \Rector\Tests\CodeQuality\Rector\Foreach_\SimplifyForeachToCoalescingRector\SimplifyForeachToCoalescingRectorTest
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*/
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final class SimplifyForeachToCoalescingRector extends AbstractRector
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{
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/**
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* @var ForeachManipulator
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*/
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private $foreachManipulator;
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/**
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* @var Return_|null
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*/
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private $return;
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public function __construct(ForeachManipulator $foreachManipulator)
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{
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$this->foreachManipulator = $foreachManipulator;
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}
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public function getRuleDefinition(): RuleDefinition
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{
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return new RuleDefinition(
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'Changes foreach that returns set value to ??',
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[
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new CodeSample(
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<<<'CODE_SAMPLE'
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foreach ($this->oldToNewFunctions as $oldFunction => $newFunction) {
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if ($currentFunction === $oldFunction) {
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return $newFunction;
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}
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}
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return null;
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CODE_SAMPLE
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,
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<<<'CODE_SAMPLE'
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return $this->oldToNewFunctions[$currentFunction] ?? null;
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CODE_SAMPLE
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),
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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 [Foreach_::class];
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}
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/**
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* @param Foreach_ $node
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*/
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public function refactor(Node $node): ?Node
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{
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if (! $this->isAtLeastPhpVersion(PhpVersionFeature::NULL_COALESCE)) {
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return null;
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}
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$this->return = null;
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if ($node->keyVar === null) {
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return null;
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}
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/** @var Return_|Assign|null $returnOrAssignNode */
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$returnOrAssignNode = $this->matchReturnOrAssignNode($node);
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if ($returnOrAssignNode === null) {
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return null;
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}
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// return $newValue;
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// we don't return the node value
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if (! $this->nodeComparator->areNodesEqual($node->valueVar, $returnOrAssignNode->expr)) {
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return null;
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}
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if ($returnOrAssignNode instanceof Return_) {
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return $this->processForeachNodeWithReturnInside($node, $returnOrAssignNode);
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}
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return $this->processForeachNodeWithAssignInside($node, $returnOrAssignNode);
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}
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/**
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* @return Assign|Return_|null
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*/
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private function matchReturnOrAssignNode(Foreach_ $foreach): ?Node
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{
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return $this->foreachManipulator->matchOnlyStmt($foreach, function (Node $node): ?Node {
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if (! $node instanceof If_) {
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return null;
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}
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if (! $node->cond instanceof Identical) {
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return null;
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}
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if (count($node->stmts) !== 1) {
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return null;
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}
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$innerNode = $node->stmts[0] instanceof Expression ? $node->stmts[0]->expr : $node->stmts[0];
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if ($innerNode instanceof Assign || $innerNode instanceof Return_) {
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return $innerNode;
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}
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return null;
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});
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}
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private function processForeachNodeWithReturnInside(Foreach_ $foreach, Return_ $return): ?Node
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{
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if (! $this->nodeComparator->areNodesEqual($foreach->valueVar, $return->expr)) {
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return null;
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}
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/** @var If_ $ifNode */
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$ifNode = $foreach->stmts[0];
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/** @var Identical $identicalNode */
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$identicalNode = $ifNode->cond;
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if ($this->nodeComparator->areNodesEqual($identicalNode->left, $foreach->keyVar)) {
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$checkedNode = $identicalNode->right;
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} elseif ($this->nodeComparator->areNodesEqual($identicalNode->right, $foreach->keyVar)) {
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$checkedNode = $identicalNode->left;
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} else {
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return null;
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}
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$nextNode = $foreach->getAttribute(AttributeKey::NEXT_NODE);
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// is next node Return?
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if ($nextNode instanceof Return_) {
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$this->return = $nextNode;
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$this->removeNode($this->return);
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}
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$coalesce = new Coalesce(new ArrayDimFetch(
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$foreach->expr,
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$checkedNode
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), $this->return && $this->return->expr !== null ? $this->return->expr : $checkedNode);
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if ($this->return !== null) {
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return new Return_($coalesce);
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}
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return null;
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}
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private function processForeachNodeWithAssignInside(Foreach_ $foreach, Assign $assign): ?Node
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{
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/** @var If_ $ifNode */
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$ifNode = $foreach->stmts[0];
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/** @var Identical $identicalNode */
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$identicalNode = $ifNode->cond;
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if ($this->nodeComparator->areNodesEqual($identicalNode->left, $foreach->keyVar)) {
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$checkedNode = $assign->var;
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$keyNode = $identicalNode->right;
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} elseif ($this->nodeComparator->areNodesEqual($identicalNode->right, $foreach->keyVar)) {
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$checkedNode = $assign->var;
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$keyNode = $identicalNode->left;
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} else {
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return null;
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}
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$arrayDimFetch = new ArrayDimFetch($foreach->expr, $keyNode);
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return new Assign($checkedNode, new Coalesce($arrayDimFetch, $checkedNode));
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}
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}
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