ConstExprNodeResolver - support ConstFetchNode for class constants

Author: ondrejmirtes

src/PhpDoc/ConstExprNodeResolver.php

@@ -2,6 +2,7 @@
 
 namespace PHPStan\PhpDoc;
 
+use PHPStan\Analyser\NameScope;
 use PHPStan\PhpDocParser\Ast\ConstExpr\ConstExprArrayNode;
 use PHPStan\PhpDocParser\Ast\ConstExpr\ConstExprFalseNode;
 use PHPStan\PhpDocParser\Ast\ConstExpr\ConstExprFloatNode;
@@ -10,22 +11,35 @@
 use PHPStan\PhpDocParser\Ast\ConstExpr\ConstExprNullNode;
 use PHPStan\PhpDocParser\Ast\ConstExpr\ConstExprStringNode;
 use PHPStan\PhpDocParser\Ast\ConstExpr\ConstExprTrueNode;
+use PHPStan\PhpDocParser\Ast\ConstExpr\ConstFetchNode;
+use PHPStan\Reflection\InitializerExprContext;
+use PHPStan\Reflection\InitializerExprTypeResolver;
+use PHPStan\Reflection\ReflectionProvider;
 use PHPStan\Type\Constant\ConstantArrayTypeBuilder;
 use PHPStan\Type\Constant\ConstantBooleanType;
 use PHPStan\Type\Constant\ConstantFloatType;
 use PHPStan\Type\Constant\ConstantIntegerType;
 use PHPStan\Type\Constant\ConstantStringType;
-use PHPStan\Type\MixedType;
+use PHPStan\Type\Enum\EnumCaseObjectType;
+use PHPStan\Type\ErrorType;
 use PHPStan\Type\NullType;
 use PHPStan\Type\Type;
+use function strtolower;
 
 final class ConstExprNodeResolver
 {
 
-	public function resolve(ConstExprNode $node): Type
+	public function __construct(
+		private ReflectionProvider\ReflectionProviderProvider $reflectionProviderProvider,
+		private InitializerExprTypeResolver $initializerExprTypeResolver,
+	)
+	{
+	}
+
+	public function resolve(ConstExprNode $node, NameScope $nameScope): Type
 	{
 		if ($node instanceof ConstExprArrayNode) {
-			return $this->resolveArrayNode($node);
+			return $this->resolveArrayNode($node, $nameScope);
 		}
 
 		if ($node instanceof ConstExprFalseNode) {
@@ -52,22 +66,74 @@ public function resolve(ConstExprNode $node): Type
 			return new ConstantStringType($node->value);
 		}
 
-		return new MixedType();
+		if ($node instanceof ConstFetchNode) {
+			if ($nameScope->getClassName() !== null) {
+				switch (strtolower($node->className)) {
+					case 'static':
+					case 'self':
+						$className = $nameScope->getClassName();
+						break;
+
+					case 'parent':
+						if ($this->getReflectionProvider()->hasClass($nameScope->getClassName())) {
+							$classReflection = $this->getReflectionProvider()->getClass($nameScope->getClassName());
+							if ($classReflection->getParentClass() === null) {
+								return new ErrorType();
+
+							}
+
+							$className = $classReflection->getParentClass()->getName();
+						}
+						break;
+				}
+			}
+			if (!isset($className)) {
+				$className = $nameScope->resolveStringName($node->className);
+			}
+			if (!$this->getReflectionProvider()->hasClass($className)) {
+				return new ErrorType();
+			}
+			$classReflection = $this->getReflectionProvider()->getClass($className);
+			if (!$classReflection->hasConstant($node->name)) {
+				return new ErrorType();
+			}
+			if ($classReflection->isEnum() && $classReflection->hasEnumCase($node->name)) {
+				return new EnumCaseObjectType($classReflection->getName(), $node->name);
+			}
+
+			$reflectionConstant = $classReflection->getNativeReflection()->getReflectionConstant($node->name);
+			if ($reflectionConstant === false) {
+				return new ErrorType();
+			}
+			$declaringClass = $reflectionConstant->getDeclaringClass();
+
+			return $this->initializerExprTypeResolver->getType(
+				$reflectionConstant->getValueExpression(),
+				InitializerExprContext::fromClass($declaringClass->getName(), $declaringClass->getFileName() ?: null),
+			);
+		}
+
+		return new ErrorType();
 	}
 
-	private function resolveArrayNode(ConstExprArrayNode $node): Type
+	private function resolveArrayNode(ConstExprArrayNode $node, NameScope $nameScope): Type
 	{
 		$arrayBuilder = ConstantArrayTypeBuilder::createEmpty();
 		foreach ($node->items as $item) {
 			if ($item->key === null) {
 				$key = null;
 			} else {
-				$key = $this->resolve($item->key);
+				$key = $this->resolve($item->key, $nameScope);
 			}
-			$arrayBuilder->setOffsetValueType($key, $this->resolve($item->value));
+			$arrayBuilder->setOffsetValueType($key, $this->resolve($item->value, $nameScope));
 		}
 
 		return $arrayBuilder->getArray();
 	}
 
+	private function getReflectionProvider(): ReflectionProvider
+	{
+		return $this->reflectionProviderProvider->getReflectionProvider();
+	}
+
 }

src/PhpDoc/PhpDocNodeResolver.php

@@ -196,7 +196,7 @@ public function resolveMethodTags(PhpDocNode $phpDocNode, NameScope $nameScope):
 					}
 					$defaultValue = null;
 					if ($parameterNode->defaultValue !== null) {
-						$defaultValue = $this->constExprNodeResolver->resolve($parameterNode->defaultValue);
+						$defaultValue = $this->constExprNodeResolver->resolve($parameterNode->defaultValue, $nameScope);
 					}
 
 					$parameters[$parameterName] = new MethodTagParameter(

src/PhpDoc/TypeNodeResolver.php

@@ -1059,6 +1059,7 @@ private function resolveConstTypeNode(ConstTypeNode $typeNode, NameScope $nameSc
 
 							$className = $classReflection->getParentClass()->getName();
 						}
+						break;
 				}
 			}