fix(DefinitionResolver): fix methods with self return type (#550)

Author: phil-nelson

src/DefinitionResolver.php

@@ -729,7 +729,7 @@ public function resolveExpressionNodeToType($expr)
                     foreach ($classDef->getAncestorDefinitions($this->index, true) as $fqn => $def) {
                         $def = $this->index->getDefinition($fqn . $add);
                         if ($def !== null) {
-                            if ($def->type instanceof Types\This) {
+                            if ($def->type instanceof Types\This || $def->type instanceof Types\Self_) {
                                 return new Types\Object_(new Fqsen('\\' . $classFqn));
                             }
                             return $def->type;
@@ -1090,6 +1090,12 @@ public function getTypeFromNode($node)
                 if ($node->returnType instanceof PhpParser\Token) {
                     // Resolve a string like "bool" to a type object
                     return $this->typeResolver->resolve($node->returnType->getText($node->getFileContents()));
+                } elseif ($node->returnType->getResolvedName() === 'self') {
+                    $classNode = $node->getFirstAncestor(Node\Statement\ClassDeclaration::class);
+                    if ($classNode) {
+                        $classFqn = (string)$classNode->getNamespacedName();
+                        return new Types\Object_(new Fqsen('\\' . $classFqn));
+                    }
                 }
                 return new Types\Object_(new Fqsen('\\' . (string)$node->returnType->getResolvedName()));
             }

tests/Validation/cases/WithReturnTypehints.php.expected.json

@@ -71,7 +71,7 @@
                 },
                 "containerName": "Fixtures\\Prophecy\\WithReturnTypehints"
             },
-            "type__tostring": "\\self",
+            "type__tostring": "\\Fixtures\\Prophecy\\WithReturnTypehints",
             "type": {},
             "declarationLine": "public function getSelf(): self {",
             "documentation": null,

tests/Validation/cases/staticMethodReturnType.php

@@ -5,5 +5,7 @@ public static function staticFoo(): FooClass {
         return new FooClass();
     }
 
+    public static function staticSelf(): self { }
+
     public function bar() { }
 }

tests/Validation/cases/staticMethodReturnType.php.expected.json

@@ -50,6 +50,31 @@
                 "parameters": []
             }
         },
+        "FooClass::staticSelf()": {
+            "fqn": "FooClass::staticSelf()",
+            "extends": [],
+            "isMember": true,
+            "roamed": false,
+            "isStatic": true,
+            "canBeInstantiated": false,
+            "symbolInformation": {
+                "name": "staticSelf",
+                "kind": 6,
+                "location": {
+                    "uri": "./staticMethodReturnType.php"
+                },
+                "containerName": "FooClass"
+            },
+            "type__tostring": "\\FooClass",
+            "type": {},
+            "declarationLine": "public static function staticSelf(): self { }",
+            "documentation": null,
+            "signatureInformation": {
+                "label": "()",
+                "documentation": null,
+                "parameters": []
+            }
+        },
         "FooClass->bar()": {
             "fqn": "FooClass->bar()",
             "extends": [],