Extract Function: Approximate non-resolvable types with nearest resolvable supertype when possible

#KT-7120 Fixed

idea/idea-analysis/src/org/jetbrains/kotlin/idea/util/ImportsUtils.kt

@@ -1,71 +0,0 @@
-/*
- * Copyright 2010-2015 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.jetbrains.kotlin.idea.imports
-
-import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
-import org.jetbrains.kotlin.name.FqName
-import org.jetbrains.kotlin.descriptors.ConstructorDescriptor
-import org.jetbrains.kotlin.descriptors.PackageViewDescriptor
-import org.jetbrains.kotlin.descriptors.ClassDescriptor
-import org.jetbrains.kotlin.descriptors.CallableDescriptor
-import org.jetbrains.kotlin.psi.psiUtil.getReceiverExpression
-import com.intellij.psi.PsiElement
-import org.jetbrains.kotlin.types.JetType
-import org.jetbrains.kotlin.resolve.descriptorUtil.getImportableDescriptor
-import org.jetbrains.kotlin.resolve.descriptorUtil.isExtension
-import org.jetbrains.kotlin.psi.*
-import org.jetbrains.kotlin.resolve.*
-
-public val DeclarationDescriptor.importableFqName: FqName?
-    get() {
-        val mayBeUnsafe = DescriptorUtils.getFqName(getImportableDescriptor())
-        return if (mayBeUnsafe.isSafe()) mayBeUnsafe.toSafe() else null
-    }
-
-public val DeclarationDescriptor.importableFqNameSafe: FqName
-    get() = DescriptorUtils.getFqNameSafe(getImportableDescriptor())
-
-public fun DeclarationDescriptor.canBeReferencedViaImport(): Boolean {
-    if (this is PackageViewDescriptor ||
-        DescriptorUtils.isTopLevelDeclaration(this) ||
-        (this is CallableDescriptor && DescriptorUtils.isStaticDeclaration(this))) {
-        return !getName().isSpecial()
-    }
-
-    val parentClass = getContainingDeclaration() as? ClassDescriptor ?: return false
-    if (!parentClass.canBeReferencedViaImport()) return false
-
-    return when (this) {
-        is ConstructorDescriptor -> !parentClass.isInner() // inner class constructors can't be referenced via import
-        is ClassDescriptor -> true
-        else -> false
-    }
-}
-
-public fun JetType.canBeReferencedViaImport(): Boolean {
-    val descriptor = getConstructor().getDeclarationDescriptor()
-    return descriptor != null && descriptor.canBeReferencedViaImport()
-}
-
-// for cases when class qualifier refers companion object treats it like reference to class itself
-public fun JetReferenceExpression.getImportableTargets(bindingContext: BindingContext): Collection<DeclarationDescriptor> {
-    val targets = bindingContext[BindingContext.SHORT_REFERENCE_TO_COMPANION_OBJECT, this]?.let { listOf(it) }
-                     ?: bindingContext[BindingContext.REFERENCE_TARGET, this]?.let { listOf(it) }
-                     ?: bindingContext[BindingContext.AMBIGUOUS_REFERENCE_TARGET, this]
-                     ?: listOf()
-    return targets.map { it.getImportableDescriptor() }.toSet()
-}