Implement UnaryMinusHandler

Author: staabm

src/Analyser/Generator/ExprHandler/UnaryMinusHandler.php

@@ -0,0 +1,51 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Analyser\Generator\ExprHandler;
+
+use Generator;
+use PhpParser\Node\Expr;
+use PhpParser\Node\Stmt;
+use PHPStan\Analyser\ExpressionContext;
+use PHPStan\Analyser\Generator\ExprAnalysisRequest;
+use PHPStan\Analyser\Generator\ExprAnalysisResult;
+use PHPStan\Analyser\Generator\ExprHandler;
+use PHPStan\Analyser\Generator\GeneratorScope;
+use PHPStan\Analyser\SpecifiedTypes;
+use PHPStan\DependencyInjection\AutowiredService;
+use PHPStan\Reflection\InitializerExprTypeResolver;
+
+/**
+ * @implements ExprHandler<Expr\UnaryMinus>
+ */
+#[AutowiredService]
+final class UnaryMinusHandler implements ExprHandler
+{
+
+	public function __construct(private InitializerExprTypeResolver $initializerExprTypeResolver)
+	{
+	}
+
+	public function supports(Expr $expr): bool
+	{
+		return $expr instanceof Expr\UnaryMinus;
+	}
+
+	public function analyseExpr(Stmt $stmt, Expr $expr, GeneratorScope $scope, ExpressionContext $context, ?callable $alternativeNodeCallback): Generator
+	{
+		$result = yield new ExprAnalysisRequest($stmt, $expr->expr, $scope, $context->enterDeep(), $alternativeNodeCallback);
+
+		return new ExprAnalysisResult(
+			$this->initializerExprTypeResolver->getUnaryMinusTypeFromType($expr->expr, $result->type),
+			$this->initializerExprTypeResolver->getUnaryMinusTypeFromType($expr->expr, $result->nativeType),
+			$result->scope,
+			hasYield: $result->hasYield,
+			isAlwaysTerminating: $result->isAlwaysTerminating,
+			throwPoints: $result->throwPoints,
+			impurePoints: $result->impurePoints,
+			specifiedTruthyTypes: new SpecifiedTypes(),
+			specifiedFalseyTypes: new SpecifiedTypes(),
+			specifiedNullTypes: new SpecifiedTypes(),
+		);
+	}
+
+}

src/Reflection/InitializerExprTypeResolver.php

@@ -2522,7 +2522,14 @@ public function getClassConstFetchType(Name|Expr $class, string $constantName, ?
 	 */
 	public function getUnaryMinusType(Expr $expr, callable $getTypeCallback): Type
 	{
-		$type = $getTypeCallback($expr)->toNumber();
+		$type = $getTypeCallback($expr);
+
+		return $this->getUnaryMinusTypeFromType($expr, $type);
+	}
+
+	public function getUnaryMinusTypeFromType(Expr $expr, Type $type): Type
+	{
+		$type = $type->toNumber();
 		$scalarValues = $type->getConstantScalarValues();
 
 		if (count($scalarValues) > 0) {

tests/PHPStan/Analyser/Generator/data/gnsr.php

@@ -191,6 +191,15 @@ public function doConcat($a, $b, string $c, string $d): void
 		assertNativeType('string', $c . $d);
 	}
 
+	function doUnaryMinus(int $i) {
+		$a = '1';
+
+		assertType('-1', -$a);
+		assertNativeType('-1', -$a);
+		assertType('int', -$i);
+		assertNativeType('int', -$i);
+	}
+
 	/**
 	 * @param int $a
 	 * @param int $b