mirror of https://github.com/rectorphp/rector.git
126 lines
4.0 KiB
PHP
126 lines
4.0 KiB
PHP
<?php
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declare (strict_types=1);
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namespace Rector\Php70\Rector\Ternary;
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use PhpParser\Node;
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use PhpParser\Node\Expr\BinaryOp;
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use PhpParser\Node\Expr\BinaryOp\Greater;
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use PhpParser\Node\Expr\BinaryOp\Smaller;
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use PhpParser\Node\Expr\BinaryOp\Spaceship;
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use PhpParser\Node\Expr\Ternary;
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use Rector\PhpParser\Node\Value\ValueResolver;
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use Rector\Rector\AbstractRector;
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use Rector\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://wiki.php.net/rfc/combined-comparison-operator
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* @see \Rector\Tests\Php70\Rector\Ternary\TernaryToSpaceshipRector\TernaryToSpaceshipRectorTest
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*/
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final class TernaryToSpaceshipRector extends AbstractRector implements MinPhpVersionInterface
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{
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/**
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* @readonly
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* @var \Rector\PhpParser\Node\Value\ValueResolver
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*/
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private $valueResolver;
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public function __construct(ValueResolver $valueResolver)
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{
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$this->valueResolver = $valueResolver;
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}
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public function getRuleDefinition() : RuleDefinition
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{
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return new RuleDefinition('Use <=> spaceship instead of ternary with same effect', [new CodeSample(<<<'CODE_SAMPLE'
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function order_func($a, $b) {
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return ($a < $b) ? -1 : (($a > $b) ? 1 : 0);
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}
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CODE_SAMPLE
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, <<<'CODE_SAMPLE'
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function order_func($a, $b) {
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return $a <=> $b;
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}
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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 [Ternary::class];
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}
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/**
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* @param Ternary $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->shouldSkip($node)) {
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return null;
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}
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/** @var Ternary $nestedTernary */
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$nestedTernary = $node->else;
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$spaceshipNode = $this->processSmallerThanTernary($node, $nestedTernary);
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if ($spaceshipNode instanceof Spaceship) {
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return $spaceshipNode;
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}
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return $this->processGreaterThanTernary($node, $nestedTernary);
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}
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public function provideMinPhpVersion() : int
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{
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return PhpVersionFeature::SPACESHIP;
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}
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private function shouldSkip(Ternary $ternary) : bool
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{
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if (!$ternary->cond instanceof BinaryOp) {
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return \true;
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}
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if (!$ternary->else instanceof Ternary) {
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return \true;
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}
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$nestedTernary = $ternary->else;
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if (!$nestedTernary->cond instanceof BinaryOp) {
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return \true;
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}
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// $a X $b ? . : ($a X $b ? . : .)
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if (!$this->nodeComparator->areNodesEqual($ternary->cond->left, $nestedTernary->cond->left)) {
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return \true;
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}
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// $a X $b ? . : ($a X $b ? . : .)
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return !$this->nodeComparator->areNodesEqual($ternary->cond->right, $nestedTernary->cond->right);
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}
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/**
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* Matches "$a < $b ? -1 : ($a > $b ? 1 : 0)"
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*/
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private function processSmallerThanTernary(Ternary $node, Ternary $nestedTernary) : ?Spaceship
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{
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if (!$node->cond instanceof Smaller) {
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return null;
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}
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if (!$nestedTernary->cond instanceof Greater) {
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return null;
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}
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if (!$this->valueResolver->areValuesEqual([$node->if, $nestedTernary->if, $nestedTernary->else], [-1, 1, 0])) {
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return null;
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}
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return new Spaceship($node->cond->left, $node->cond->right);
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}
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/**
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* Matches "$a > $b ? -1 : ($a < $b ? 1 : 0)"
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*/
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private function processGreaterThanTernary(Ternary $node, Ternary $nestedTernary) : ?Spaceship
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{
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if (!$node->cond instanceof Greater) {
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return null;
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}
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if (!$nestedTernary->cond instanceof Smaller) {
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return null;
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}
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if (!$this->valueResolver->areValuesEqual([$node->if, $nestedTernary->if, $nestedTernary->else], [-1, 1, 0])) {
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return null;
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}
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return new Spaceship($node->cond->right, $node->cond->left);
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}
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}
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