renderDataFlowValue() moved to test from completion

idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/DataFlowInfoUtilForCompletion.kt

@@ -1,43 +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.completion
-
-import org.jetbrains.kotlin.resolve.calls.smartcasts.DataFlowValue
-import org.jetbrains.kotlin.resolve.scopes.receivers.ImplicitReceiver
-import org.jetbrains.kotlin.psi.KtExpression
-import org.jetbrains.kotlin.descriptors.VariableDescriptor
-import org.jetbrains.kotlin.descriptors.PackageViewDescriptor
-import org.jetbrains.kotlin.resolve.calls.smartcasts.DataFlowValueFactory
-import org.jetbrains.kotlin.resolve.calls.smartcasts.IdentifierInfo
-
-fun renderDataFlowValue(value: DataFlowValue): String? {
-    // If it is not a stable identifier, there's no point in rendering it
-    if (!value.isPredictable) return null
-
-    fun renderId(identifierInfo: IdentifierInfo): String? = with (identifierInfo) {
-        when (this) {
-            is DataFlowValueFactory.ExpressionIdentifierInfo -> expression.text
-            is IdentifierInfo.Receiver -> (this.value as? ImplicitReceiver)?.declarationDescriptor?.name?.let { "this@$it" }
-            is IdentifierInfo.Variable -> variable.name.asString()
-            is IdentifierInfo.PackageOrClass -> (descriptor as? PackageViewDescriptor)?.let { it.fqName.asString() }
-            is IdentifierInfo.Qualified -> renderId(receiverInfo) + "." + renderId(selectorInfo)
-            else -> null
-        }
-    }
-
-    return renderId(value.identifierInfo)
-}