mirror of https://github.com/rectorphp/rector.git
164 lines
5.1 KiB
PHP
164 lines
5.1 KiB
PHP
<?php
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declare (strict_types=1);
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namespace Rector\DeadCode\Rector\Plus;
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use PhpParser\Node;
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use PhpParser\Node\Expr;
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use PhpParser\Node\Expr\AssignOp;
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use PhpParser\Node\Expr\AssignOp\Div as AssignDiv;
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use PhpParser\Node\Expr\AssignOp\Minus as AssignMinus;
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use PhpParser\Node\Expr\AssignOp\Mul as AssignMul;
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use PhpParser\Node\Expr\AssignOp\Plus as AssignPlus;
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use PhpParser\Node\Expr\BinaryOp;
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use PhpParser\Node\Expr\BinaryOp\Div;
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use PhpParser\Node\Expr\BinaryOp\Minus;
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use PhpParser\Node\Expr\BinaryOp\Mul;
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use PhpParser\Node\Expr\BinaryOp\Plus;
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use PhpParser\Node\Expr\ClassConstFetch;
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use PhpParser\Node\Expr\UnaryMinus;
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use Rector\PhpParser\Node\Value\ValueResolver;
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use Rector\Rector\AbstractRector;
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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://3v4l.org/I0BGs
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*
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* @see \Rector\Tests\DeadCode\Rector\Plus\RemoveDeadZeroAndOneOperationRector\RemoveDeadZeroAndOneOperationRectorTest
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*/
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final class RemoveDeadZeroAndOneOperationRector extends AbstractRector
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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 = $valueResolver;
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}
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public function getRuleDefinition() : RuleDefinition
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{
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return new RuleDefinition('Remove operation with 1 and 0, that have no effect on the value', [new CodeSample(<<<'CODE_SAMPLE'
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class SomeClass
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{
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public function run()
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{
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$value = 5 * 1;
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$value = 5 + 0;
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}
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}
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CODE_SAMPLE
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, <<<'CODE_SAMPLE'
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class SomeClass
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{
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public function run()
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{
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$value = 5;
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$value = 5;
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}
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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 [Plus::class, Minus::class, Mul::class, Div::class, AssignPlus::class, AssignMinus::class, AssignMul::class, AssignDiv::class];
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}
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/**
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* @param Plus|Minus|Mul|Div|AssignPlus|AssignMinus|AssignMul|AssignDiv $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 AssignOp) {
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return $this->processAssignOp($node);
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}
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// -, +
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return $this->processBinaryOp($node);
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}
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private function processAssignOp(AssignOp $assignOp) : ?Expr
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{
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// +=, -=
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if ($assignOp instanceof AssignPlus || $assignOp instanceof AssignMinus) {
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if (!$this->valueResolver->isValue($assignOp->expr, 0)) {
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return null;
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}
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if ($this->nodeTypeResolver->isNumberType($assignOp->var)) {
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return $assignOp->var;
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}
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}
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// *, /
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if ($assignOp instanceof AssignMul || $assignOp instanceof AssignDiv) {
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if (!$this->valueResolver->isValue($assignOp->expr, 1)) {
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return null;
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}
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if ($this->nodeTypeResolver->isNumberType($assignOp->var)) {
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return $assignOp->var;
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}
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}
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return null;
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}
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private function processBinaryOp(Node $node) : ?Expr
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{
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if ($node instanceof Plus || $node instanceof Minus) {
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return $this->processBinaryPlusAndMinus($node);
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}
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// *, /
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if ($node instanceof Mul) {
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return $this->processBinaryMulAndDiv($node);
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}
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if ($node instanceof Div) {
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return $this->processBinaryMulAndDiv($node);
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}
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return null;
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}
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private function areNumberType(BinaryOp $binaryOp) : bool
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{
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if (!$this->nodeTypeResolver->isNumberType($binaryOp->left)) {
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return \false;
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}
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return $this->nodeTypeResolver->isNumberType($binaryOp->right);
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}
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/**
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* @param \PhpParser\Node\Expr\BinaryOp\Plus|\PhpParser\Node\Expr\BinaryOp\Minus $binaryOp
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*/
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private function processBinaryPlusAndMinus($binaryOp) : ?Expr
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{
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if (!$this->areNumberType($binaryOp)) {
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return null;
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}
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if ($this->valueResolver->isValue($binaryOp->left, 0) && $this->nodeTypeResolver->isNumberType($binaryOp->right)) {
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if ($binaryOp instanceof Minus) {
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return new UnaryMinus($binaryOp->right);
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}
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return $binaryOp->right;
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}
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if (!$this->valueResolver->isValue($binaryOp->right, 0)) {
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return null;
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}
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return $binaryOp->left;
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}
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/**
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* @param \PhpParser\Node\Expr\BinaryOp\Mul|\PhpParser\Node\Expr\BinaryOp\Div $binaryOp
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*/
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private function processBinaryMulAndDiv($binaryOp) : ?Expr
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{
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if ($binaryOp->left instanceof ClassConstFetch || $binaryOp->right instanceof ClassConstFetch) {
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return null;
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}
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if (!$this->areNumberType($binaryOp)) {
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return null;
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}
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if ($binaryOp instanceof Mul && $this->valueResolver->isValue($binaryOp->left, 1) && $this->nodeTypeResolver->isNumberType($binaryOp->right)) {
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return $binaryOp->right;
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}
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if (!$this->valueResolver->isValue($binaryOp->right, 1)) {
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return null;
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}
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return $binaryOp->left;
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}
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}
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