191: Uast: support convertToAlternatives for KtFile

plugins/uast-kotlin/src/org/jetbrains/uast/kotlin/KotlinUastLanguagePlugin.kt.191

@@ -28,6 +28,7 @@ import org.jetbrains.kotlin.asJava.LightClassUtil
 import org.jetbrains.kotlin.asJava.classes.KtLightClass
 import org.jetbrains.kotlin.asJava.classes.KtLightClassForFacade
 import org.jetbrains.kotlin.asJava.elements.*
+import org.jetbrains.kotlin.asJava.findFacadeClass
 import org.jetbrains.kotlin.asJava.toLightClass
 import org.jetbrains.kotlin.codegen.state.KotlinTypeMapper
 import org.jetbrains.kotlin.config.LanguageVersionSettings
@@ -153,6 +154,7 @@ class KotlinUastLanguagePlugin : UastLanguagePlugin {
 
     @Suppress("UNCHECKED_CAST")
     override fun <T : UElement> convertToAlternatives(element: PsiElement, requiredTypes: Array<out Class<out T>>): Sequence<T> = when {
+        element is KtFile -> KotlinConverter.convertKtFile(element, null, requiredTypes) as Sequence<T>
         (element is KtProperty && !element.isLocal) -> KotlinConverter.convertNonLocalProperty(element, null, requiredTypes) as Sequence<T>
         element is KtParameter -> KotlinConverter.convertParameter(element, null, requiredTypes) as Sequence<T>
         element is KtClassOrObject -> KotlinConverter.convertClassOrObject(element, null, requiredTypes) as Sequence<T>
@@ -505,7 +507,7 @@ internal object KotlinConverter {
 
                 is KtParameter -> convertParameter(original, givenParent, this).firstOrNull()
 
-                is KtFile -> el<UFile> { KotlinUFile(original) }
+                is KtFile -> convertKtFile(original, givenParent, this).firstOrNull()
                 is FakeFileForLightClass -> el<UFile> { KotlinUFile(original.navigationElement) }
                 is KtAnnotationEntry -> el<UAnnotation>(build(::KotlinUAnnotation))
                 is KtCallExpression ->
@@ -591,6 +593,16 @@ internal object KotlinConverter {
         )
     }
 
+    fun convertKtFile(
+        element: KtFile,
+        givenParent: UElement?,
+        requiredTypes: Array<out Class<out UElement>>
+    ): Sequence<UElement> = requiredTypes.accommodate(
+        alternative { KotlinUFile(element) },
+        alternative { element.findFacadeClass()?.let { KotlinUClass.create(it, givenParent) } }
+    )
+
+
     internal fun convertOrEmpty(expression: KtExpression?, parent: UElement?): UExpression {
         return expression?.let { convertExpression(it, parent, DEFAULT_EXPRESSION_TYPES_LIST) } ?: UastEmptyExpression
     }

plugins/uast-kotlin/testData/InnerClasses.splog.txt.191

@@ -2,6 +2,8 @@ UFile (package = )
     UClass (name = Foo)
         UClass (name = Bar)
             UAnnotationMethod (name = Bar)
+                UField (name = a)
+                UField (name = b)
             UAnnotationMethod (name = getAPlusB)
             UClass (name = Baz)
                 UAnnotationMethod (name = doNothing)

plugins/uast-kotlin/testData/LocalDeclarations.altlog.txt.191

@@ -1,4 +1,4 @@
-[1]:[UFile (package = )]
+[2]:[UFile (package = ), UClass (name = LocalDeclarationsKt)]
     [1]:[UAnnotationMethod (name = foo)]
         [1]:[UIdentifier (Identifier (foo))]
         [1]:[UDeclarationsExpression]