FIR IDE: refactor, simplify structure element class names

idea/idea-frontend-fir/idea-fir-low-level-api/src/org/jetbrains/kotlin/idea/fir/low/level/api/file/structure/FileElementFactory.kt

@@ -21,14 +21,14 @@ internal object FileElementFactory {
         firFile: FirFile,
     ): FileStructureElement = when {
         ktDeclaration is KtNamedFunction && ktDeclaration.name != null && ktDeclaration.hasExplicitTypeOrUnit ->
-            IncrementallyReanalyzableFunction(
+            ReanalyzableFunctionStructureElement(
                 firFile,
                 ktDeclaration,
                 (firDeclaration as FirSimpleFunction).symbol,
                 ktDeclaration.modificationStamp
             )
 
-        else -> NonLocalDeclarationFileStructureElement(
+        else -> NonReanalyzableDeclarationStructureElement(
             firFile,
             firDeclaration,
             ktDeclaration,
@@ -45,6 +45,6 @@ internal object FileElementFactory {
         else -> false
     }
 
-    val KtNamedFunction.hasExplicitTypeOrUnit
+    private val KtNamedFunction.hasExplicitTypeOrUnit
         get() = hasBlockBody() || typeReference != null
 }

idea/idea-frontend-fir/idea-fir-low-level-api/src/org/jetbrains/kotlin/idea/fir/low/level/api/file/structure/FileStructure.kt

@@ -13,11 +13,8 @@ import org.jetbrains.kotlin.idea.fir.low.level.api.file.builder.ModuleFileCache
 import org.jetbrains.kotlin.idea.fir.low.level.api.lazy.resolve.FirLazyDeclarationResolver
 import org.jetbrains.kotlin.idea.fir.low.level.api.providers.firIdeProvider
 import org.jetbrains.kotlin.idea.fir.low.level.api.util.findSourceNonLocalFirDeclaration
-import org.jetbrains.kotlin.idea.search.getKotlinFqName
 import org.jetbrains.kotlin.idea.util.getElementTextInContext
-import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.psi.*
-import org.jetbrains.kotlin.psi.psiUtil.containingClassOrObject
 import org.jetbrains.kotlin.psi.psiUtil.forEachDescendantOfType
 import java.util.concurrent.ConcurrentHashMap
 
@@ -97,7 +94,7 @@ internal class FileStructure(
                 FirResolvePhase.IMPORTS,
                 checkPCE = true
             )
-            FileWithoutDeclarationsFileStructureElement(
+            RootStructureElement(
                 firFile,
                 container,
             )

idea/idea-frontend-fir/idea-fir-low-level-api/src/org/jetbrains/kotlin/idea/fir/low/level/api/file/structure/FileStructureElement.kt

@@ -64,7 +64,7 @@ internal sealed class ReanalyzableStructureElement<KT : KtDeclaration> : FileStr
     }
 }
 
-internal class IncrementallyReanalyzableFunction(
+internal class ReanalyzableFunctionStructureElement(
     override val firFile: FirFile,
     override val psi: KtNamedFunction,
     override val firSymbol: FirFunctionSymbol<*>,
@@ -90,7 +90,7 @@ internal class IncrementallyReanalyzableFunction(
         cache: ModuleFileCache,
         firLazyDeclarationResolver: FirLazyDeclarationResolver,
         firIdeProvider: FirIdeProvider,
-    ): IncrementallyReanalyzableFunction {
+    ): ReanalyzableFunctionStructureElement {
         val newFunction = firIdeProvider.buildFunctionWithBody(newKtDeclaration) as FirSimpleFunction
         val originalFunction = firSymbol.fir as FirSimpleFunction
 
@@ -108,7 +108,7 @@ internal class IncrementallyReanalyzableFunction(
                 reresolveFile = true,
             )
             return cache.firFileLockProvider.withReadLock(firFile) {
-                IncrementallyReanalyzableFunction(
+                ReanalyzableFunctionStructureElement(
                     firFile,
                     newKtDeclaration,
                     newFunction.symbol,
@@ -124,7 +124,7 @@ internal class IncrementallyReanalyzableFunction(
     }
 }
 
-internal class NonLocalDeclarationFileStructureElement(
+internal class NonReanalyzableDeclarationStructureElement(
     override val firFile: FirFile,
     fir: FirDeclaration,
     override val psi: KtDeclaration,
@@ -172,7 +172,7 @@ internal class NonLocalDeclarationFileStructureElement(
 }
 
 
-internal data class FileWithoutDeclarationsFileStructureElement(
+internal data class RootStructureElement(
     override val firFile: FirFile,
     override val psi: KtFile,
 ) : FileStructureElement() {