Fixed auto-import of operator functions broken before + fixed bug in its implementation

idea/ide-common/src/org/jetbrains/jet/plugin/codeInsight/ReferenceVariantsHelper.kt

@@ -84,8 +84,6 @@ public class ReferenceVariantsHelper(
         val pair = getExplicitReceiverData(expression)
         if (pair != null) {
             val (receiverExpression, callType) = pair
-            fun filterIfInfix(descriptor: DeclarationDescriptor)
-                    = if (callType == CallType.INFIX) descriptor is SimpleFunctionDescriptor && descriptor.getValueParameters().size == 1 else true
 
             // Process as call expression
             val descriptors = HashSet<DeclarationDescriptor>()
@@ -93,7 +91,7 @@ public class ReferenceVariantsHelper(
             val qualifier = context[BindingContext.QUALIFIER, receiverExpression]
             if (qualifier != null) {
                 // It's impossible to add extension function for package or class (if it's class object, expression type is not null)
-                qualifier.scope.getDescriptorsFiltered(kindFilter exclude DescriptorKindExclude.Extensions, nameFilter).filterTo(descriptors, ::filterIfInfix)
+                qualifier.scope.getDescriptorsFiltered(kindFilter exclude DescriptorKindExclude.Extensions, nameFilter).filterTo(descriptors)  { callType.canCall(it) }
             }
 
             val expressionType = if (shouldCastToRuntimeType)
@@ -106,7 +104,7 @@ public class ReferenceVariantsHelper(
 
                 val mask = kindFilter.withoutKinds(DescriptorKindFilter.NON_SINGLETON_CLASSIFIERS_MASK).exclude(DescriptorKindExclude.Extensions)
                 for (variant in SmartCastUtils.getSmartCastVariantsWithLessSpecificExcluded(receiverValue, context, dataFlowInfo)) {
-                    variant.getMemberScope().getDescriptorsFiltered(mask, nameFilter).filterTo(descriptors, ::filterIfInfix)
+                    variant.getMemberScope().getDescriptorsFiltered(mask, nameFilter).filterTo(descriptors) { callType.canCall(it) }
                 }
 
                 descriptors.addCallableExtensions(resolutionScope, receiverValue, dataFlowInfo, callType, kindFilter, nameFilter)
@@ -204,6 +202,8 @@ public class ReferenceVariantsHelper(
                         CallType.NORMAL
                 }
 
+                is JetUnaryExpression -> CallType.UNARY
+
                 else -> return null
             }
             return receiverExpression to callType

idea/ide-common/src/org/jetbrains/jet/plugin/util/extensionsUtils.kt

@@ -24,11 +24,23 @@ import org.jetbrains.jet.lang.resolve.scopes.JetScope
 import org.jetbrains.jet.lang.descriptors.SimpleFunctionDescriptor
 import org.jetbrains.jet.lang.resolve.calls.smartcasts.SmartCastUtils
 import org.jetbrains.jet.lang.types.TypeUtils
+import org.jetbrains.jet.lang.descriptors.DeclarationDescriptor
 
 public enum class CallType {
     NORMAL
     SAFE
-    INFIX
+
+    INFIX {
+        override fun canCall(descriptor: DeclarationDescriptor)
+                = descriptor is SimpleFunctionDescriptor && descriptor.getValueParameters().size == 1
+    }
+
+    UNARY {
+        override fun canCall(descriptor: DeclarationDescriptor)
+                = descriptor is SimpleFunctionDescriptor && descriptor.getValueParameters().size == 0
+    }
+
+    public open fun canCall(descriptor: DeclarationDescriptor): Boolean = true
 }
 
 public fun CallableDescriptor.substituteExtensionIfCallable(receivers: Collection<ReceiverValue>,
@@ -54,10 +66,7 @@ public fun CallableDescriptor.substituteExtensionIfCallable(
         dataFlowInfo: DataFlowInfo
 ): Collection<CallableDescriptor> {
     if (!receiver.exists()) return listOf()
-
-    if (callType == CallType.INFIX && (this !is SimpleFunctionDescriptor || getValueParameters().size() != 1)) {
-        return listOf()
-    }
+    if (!callType.canCall(this)) return listOf()
 
     var types = SmartCastUtils.getSmartCastVariants(receiver, bindingContext, dataFlowInfo).stream()
 

idea/testData/quickfix/autoImports/falsePostfixOperator.before.Main.kt

@@ -0,0 +1,16 @@
+// "Import" "false"
+// ACTION: Create function 'inc'
+// ACTION: Create local variable '++'
+// ACTION: Create parameter '++'
+// ACTION: Inspection 'UNUSED_CHANGED_VALUE' options
+// ACTION: Replace overloaded operator with function call
+// ERROR: Unresolved reference: ++
+
+package h
+
+trait H
+
+fun f(h: H?) {
+    var h1 = h
+    h1<caret>++
+}

idea/testData/quickfix/autoImports/falsePostfixOperator.before.data.Sample.kt

@@ -0,0 +1,4 @@
+package util
+
+fun h.H.inc(p: Int): h.H {
+}

idea/tests/org/jetbrains/jet/plugin/quickfix/QuickFixMultiFileTestGenerated.java

@@ -86,6 +86,12 @@ public class QuickFixMultiFileTestGenerated extends AbstractQuickFixMultiFileTes
             doTestWithExtraFile(fileName);
         }
 
+        @TestMetadata("falsePostfixOperator.before.Main.kt")
+        public void testFalsePostfixOperator() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("idea/testData/quickfix/autoImports/falsePostfixOperator.before.Main.kt");
+            doTestWithExtraFile(fileName);
+        }
+
         @TestMetadata("functionImport.before.Main.kt")
         public void testFunctionImport() throws Exception {
             String fileName = JetTestUtils.navigationMetadata("idea/testData/quickfix/autoImports/functionImport.before.Main.kt");