Extension SAM-adapters shown in completion

compiler/frontend.java/src/org/jetbrains/kotlin/synthetic/SamAdapterFunctionsScope.kt

@@ -25,6 +25,7 @@ import org.jetbrains.kotlin.load.java.typeEnhacement.enhanceSignature
 import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.resolve.DescriptorUtils
 import org.jetbrains.kotlin.resolve.descriptorUtil.parentsWithSelf
+import org.jetbrains.kotlin.resolve.scopes.DescriptorKindFilter
 import org.jetbrains.kotlin.resolve.scopes.JetScope
 import org.jetbrains.kotlin.storage.StorageManager
 import org.jetbrains.kotlin.types.DescriptorSubstitutor
@@ -32,6 +33,7 @@ import org.jetbrains.kotlin.types.JetType
 import org.jetbrains.kotlin.types.TypeSubstitution
 import org.jetbrains.kotlin.types.Variance
 import java.util.ArrayList
+import java.util.LinkedHashSet
 
 interface SamAdapterExtensionFunctionDescriptor : FunctionDescriptor {
     val originalFunction: FunctionDescriptor
@@ -73,6 +75,15 @@ class SamAdapterFunctionsScope(storageManager: StorageManager) : JetScope by Jet
         }
     }
 
+    override fun getSyntheticExtensionFunctions(receiverTypes: Collection<JetType>): Collection<FunctionDescriptor> {
+        return receiverTypes.flatMapTo(LinkedHashSet<FunctionDescriptor>()) { type ->
+            type.memberScope.getDescriptors(DescriptorKindFilter.FUNCTIONS)
+                    .filterIsInstance<FunctionDescriptor>()
+                    .map { extensionForFunction(it.original) }
+                    .filterNotNull()
+        }
+    }
+
     private class MyFunctionDescriptor(
             override val originalFunction: FunctionDescriptor
     ) : SamAdapterExtensionFunctionDescriptor, SimpleFunctionDescriptorImpl(

compiler/frontend/src/org/jetbrains/kotlin/resolve/AllUnderImportsScope.kt

@@ -66,6 +66,10 @@ class AllUnderImportsScope : JetScope {
         return scopes.flatMap { it.getSyntheticExtensionProperties(receiverTypes) }
     }
 
+    override fun getSyntheticExtensionFunctions(receiverTypes: Collection<JetType>): Collection<FunctionDescriptor> {
+        return scopes.flatMap { it.getSyntheticExtensionFunctions(receiverTypes) }
+    }
+
     override fun getPackage(name: Name): PackageViewDescriptor? = null // packages are not imported by all under imports
 
     override fun getLocalVariable(name: Name): VariableDescriptor? = null

compiler/frontend/src/org/jetbrains/kotlin/resolve/lazy/LazyImportScope.kt

@@ -279,6 +279,17 @@ class LazyImportScope(
         }
     }
 
+    override fun getSyntheticExtensionFunctions(receiverTypes: Collection<JetType>): Collection<FunctionDescriptor> {
+        // we do not perform any filtering by visibility here because all descriptors from both visible/invisible filter scopes are to be added anyway
+        if (filteringKind == FilteringKind.INVISIBLE_CLASSES) return listOf()
+
+        return importResolver.storageManager.compute {
+            importResolver.indexedImports.imports.flatMapTo(LinkedHashSet<FunctionDescriptor>()) { import ->
+                importResolver.getImportScope(import, LookupMode.EVERYTHING).getSyntheticExtensionFunctions(receiverTypes)
+            }
+        }
+    }
+
     override fun getDeclarationsByLabel(labelName: Name): Collection<DeclarationDescriptor> = listOf()
 
     override fun getDescriptors(kindFilter: DescriptorKindFilter, nameFilter: (Name) -> Boolean): Collection<DeclarationDescriptor> {

core/descriptors/src/org/jetbrains/kotlin/resolve/scopes/AbstractScopeAdapter.kt

@@ -59,6 +59,10 @@ public abstract class AbstractScopeAdapter : JetScope {
         return workerScope.getSyntheticExtensionProperties(receiverTypes)
     }
 
+    override fun getSyntheticExtensionFunctions(receiverTypes: Collection<JetType>): Collection<FunctionDescriptor> {
+        return workerScope.getSyntheticExtensionFunctions(receiverTypes)
+    }
+
     override fun getLocalVariable(name: Name): VariableDescriptor? {
         return workerScope.getLocalVariable(name)
     }

core/descriptors/src/org/jetbrains/kotlin/resolve/scopes/ChainedScope.kt

@@ -73,6 +73,9 @@ public open class ChainedScope(
     override fun getSyntheticExtensionProperties(receiverTypes: Collection<JetType>): Collection<PropertyDescriptor>
             = getFromAllScopes { it.getSyntheticExtensionProperties(receiverTypes) }
 
+    override fun getSyntheticExtensionFunctions(receiverTypes: Collection<JetType>): Collection<FunctionDescriptor>
+            = getFromAllScopes { it.getSyntheticExtensionFunctions(receiverTypes) }
+
     override fun getImplicitReceiversHierarchy(): List<ReceiverParameterDescriptor> {
         if (implicitReceiverHierarchy == null) {
             val result = ArrayList<ReceiverParameterDescriptor>()

core/descriptors/src/org/jetbrains/kotlin/resolve/scopes/FilteringScope.kt

@@ -44,6 +44,8 @@ public class FilteringScope(private val workerScope: JetScope, private val predi
 
     override fun getSyntheticExtensionProperties(receiverTypes: Collection<JetType>): Collection<PropertyDescriptor> = workerScope.getSyntheticExtensionProperties(receiverTypes).filter(predicate)
 
+    override fun getSyntheticExtensionFunctions(receiverTypes: Collection<JetType>): Collection<FunctionDescriptor> = workerScope.getSyntheticExtensionFunctions(receiverTypes).filter(predicate)
+
     override fun getLocalVariable(name: Name) = filterDescriptor(workerScope.getLocalVariable(name))
 
     override fun getDescriptors(kindFilter: DescriptorKindFilter,

core/descriptors/src/org/jetbrains/kotlin/resolve/scopes/JetScope.kt

@@ -39,6 +39,7 @@ public interface JetScope {
     public fun getSyntheticExtensionFunctions(receiverTypes: Collection<JetType>, name: Name): Collection<FunctionDescriptor>
 
     public fun getSyntheticExtensionProperties(receiverTypes: Collection<JetType>): Collection<PropertyDescriptor>
+    public fun getSyntheticExtensionFunctions(receiverTypes: Collection<JetType>): Collection<FunctionDescriptor>
 
     public fun getContainingDeclaration(): DeclarationDescriptor
 

core/descriptors/src/org/jetbrains/kotlin/resolve/scopes/JetScopeImpl.kt

@@ -36,6 +36,7 @@ public abstract class JetScopeImpl : JetScope {
     override fun getSyntheticExtensionFunctions(receiverTypes: Collection<JetType>, name: Name): Collection<FunctionDescriptor> = emptyList()
 
     override fun getSyntheticExtensionProperties(receiverTypes: Collection<JetType>): Collection<PropertyDescriptor> = emptyList()
+    override fun getSyntheticExtensionFunctions(receiverTypes: Collection<JetType>): Collection<FunctionDescriptor> = emptyList()
 
     override fun getDeclarationsByLabel(labelName: Name): Collection<DeclarationDescriptor> = emptyList()
 

core/descriptors/src/org/jetbrains/kotlin/resolve/scopes/SubstitutingScope.kt

@@ -76,7 +76,11 @@ public class SubstitutingScope(private val workerScope: JetScope, private val su
     override fun getSyntheticExtensionFunctions(receiverTypes: Collection<JetType>, name: Name): Collection<FunctionDescriptor>
             = substitute(workerScope.getSyntheticExtensionFunctions(receiverTypes, name))
 
-    override fun getSyntheticExtensionProperties(receiverTypes: Collection<JetType>): Collection<PropertyDescriptor> = substitute(workerScope.getSyntheticExtensionProperties(receiverTypes))
+    override fun getSyntheticExtensionProperties(receiverTypes: Collection<JetType>): Collection<PropertyDescriptor>
+            = substitute(workerScope.getSyntheticExtensionProperties(receiverTypes))
+
+    override fun getSyntheticExtensionFunctions(receiverTypes: Collection<JetType>): Collection<FunctionDescriptor>
+            = substitute(workerScope.getSyntheticExtensionFunctions(receiverTypes))
 
     override fun getPackage(name: Name) = workerScope.getPackage(name)
 

core/descriptors/src/org/jetbrains/kotlin/types/ErrorUtils.java

@@ -115,6 +115,14 @@ public class ErrorUtils {
             return ERROR_PROPERTY_GROUP;
         }
 
+        @NotNull
+        @Override
+        public Collection<FunctionDescriptor> getSyntheticExtensionFunctions(
+                @NotNull Collection<? extends JetType> receiverTypes
+        ) {
+            return Collections.<FunctionDescriptor>singleton(createErrorFunction(this));
+        }
+
         @Override
         public VariableDescriptor getLocalVariable(@NotNull Name name) {
             return ERROR_PROPERTY;
@@ -239,6 +247,14 @@ public class ErrorUtils {
             throw new IllegalStateException();
         }
 
+        @NotNull
+        @Override
+        public Collection<FunctionDescriptor> getSyntheticExtensionFunctions(
+                @NotNull Collection<? extends JetType> receiverTypes
+        ) {
+            throw new IllegalStateException();
+        }
+
         @NotNull
         @Override
         public DeclarationDescriptor getContainingDeclaration() {

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

@@ -42,7 +42,8 @@ import org.jetbrains.kotlin.types.JetType
 import org.jetbrains.kotlin.types.TypeUtils
 import org.jetbrains.kotlin.types.checker.JetTypeChecker
 import org.jetbrains.kotlin.utils.addIfNotNull
-import java.util.*
+import java.util.HashSet
+import java.util.LinkedHashSet
 
 public class ReferenceVariantsHelper(
         private val context: BindingContext,
@@ -185,11 +186,23 @@ public class ReferenceVariantsHelper(
         }
 
         if (!kindFilter.excludes.contains(DescriptorKindExclude.Extensions)) {
-            for (extension in resolutionScope.getSyntheticExtensionProperties(receiverTypes)) {
+            fun processExtension(extension: CallableDescriptor) {
-                if (nameFilter(extension.getName()) && kindFilter.accepts(extension)) {
+                if (nameFilter(extension.name) && kindFilter.accepts(extension)) {
                     addAll(extension.substituteExtensionIfCallable(receiverValue, callType, context, dataFlowInfo, containingDeclaration))
                 }
             }
+
+            if (kindFilter.acceptsKinds(DescriptorKindFilter.VARIABLES_MASK)) {
+                for (extension in resolutionScope.getSyntheticExtensionProperties(receiverTypes)) {
+                    processExtension(extension)
+                }
+            }
+
+            if (kindFilter.acceptsKinds(DescriptorKindFilter.FUNCTIONS_MASK)) {
+                for (extension in resolutionScope.getSyntheticExtensionFunctions(receiverTypes)) {
+                    processExtension(extension)
+                }
+            }
         }
     }
 

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

@@ -36,6 +36,7 @@ import org.jetbrains.kotlin.psi.psiUtil.parents
 import org.jetbrains.kotlin.renderer.DescriptorRenderer
 import org.jetbrains.kotlin.resolve.DescriptorToSourceUtils
 import org.jetbrains.kotlin.resolve.DescriptorUtils
+import org.jetbrains.kotlin.synthetic.SamAdapterExtensionFunctionDescriptor
 import org.jetbrains.kotlin.synthetic.SyntheticJavaPropertyDescriptor
 import org.jetbrains.kotlin.types.JetType
 import org.jetbrains.kotlin.types.TypeUtils
@@ -263,6 +264,9 @@ public class LookupElementFactory(
                     element = element.appendTailText(" (from $from)", true)
                 }
 
+                // no need to show them as extensions
+                original is SamAdapterExtensionFunctionDescriptor -> {}
+
                 extensionReceiver != null -> {
                     val receiverPresentation = DescriptorRenderer.SHORT_NAMES_IN_TYPES.renderType(extensionReceiver.type)
                     element = element.appendTailText(" for $receiverPresentation", true)

idea/idea-completion/testData/basic/common/SAMAdaptersStatic.kt

@@ -0,0 +1,6 @@
+fun foo() {
+    javax.swing.SwingUtilities.invoke<caret>
+}
+
+// EXIST_JAVA_ONLY: { lookupString: "invokeLater", itemText: "invokeLater", tailText: "(Runnable!)", typeText: "Unit" }
+// EXIST_JAVA_ONLY: { lookupString: "invokeLater", itemText: "invokeLater", tailText: " {...} ((() -> Unit)!)", typeText: "Unit" }

idea/idea-completion/testData/basic/custom/SAMAdapters.kt

@@ -0,0 +1,6 @@
+import lib.JavaClass
+
+fun test() = JavaClass().<caret>
+
+// EXIST: { lookupString: "execute", itemText: "execute", tailText: "(Runnable!)", typeText: "Unit" }
+// EXIST: { lookupString: "execute", itemText: "execute", tailText: " {...} ((() -> Unit)!)", typeText: "Unit" }

idea/idea-completion/testData/basic/custom/SAMAdaptersSrc/JavaClass.java

@@ -0,0 +1,5 @@
+package lib;
+
+public class JavaClass {
+    public void execute(Runnable runnable) {}
+}

idea/idea-completion/tests/org/jetbrains/kotlin/idea/completion/test/JSBasicCompletionTestGenerated.java

@@ -769,6 +769,12 @@ public class JSBasicCompletionTestGenerated extends AbstractJSBasicCompletionTes
             doTest(fileName);
         }
 
+        @TestMetadata("SAMAdaptersStatic.kt")
+        public void testSAMAdaptersStatic() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("idea/idea-completion/testData/basic/common/SAMAdaptersStatic.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("SafeCallAfterNullable.kt")
         public void testSafeCallAfterNullable() throws Exception {
             String fileName = JetTestUtils.navigationMetadata("idea/idea-completion/testData/basic/common/SafeCallAfterNullable.kt");

idea/idea-completion/tests/org/jetbrains/kotlin/idea/completion/test/JvmBasicCompletionTestGenerated.java

@@ -769,6 +769,12 @@ public class JvmBasicCompletionTestGenerated extends AbstractJvmBasicCompletionT
             doTest(fileName);
         }
 
+        @TestMetadata("SAMAdaptersStatic.kt")
+        public void testSAMAdaptersStatic() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("idea/idea-completion/testData/basic/common/SAMAdaptersStatic.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("SafeCallAfterNullable.kt")
         public void testSafeCallAfterNullable() throws Exception {
             String fileName = JetTestUtils.navigationMetadata("idea/idea-completion/testData/basic/common/SafeCallAfterNullable.kt");

idea/idea-completion/tests/org/jetbrains/kotlin/idea/completion/test/JvmWithLibBasicCompletionTestGenerated.java

@@ -47,6 +47,12 @@ public class JvmWithLibBasicCompletionTestGenerated extends AbstractJvmWithLibBa
         doTest(fileName);
     }
 
+    @TestMetadata("SAMAdapters.kt")
+    public void testSAMAdapters() throws Exception {
+        String fileName = JetTestUtils.navigationMetadata("idea/idea-completion/testData/basic/custom/SAMAdapters.kt");
+        doTest(fileName);
+    }
+
     @TestMetadata("TopLevelNonImportedExtFun.kt")
     public void testTopLevelNonImportedExtFun() throws Exception {
         String fileName = JetTestUtils.navigationMetadata("idea/idea-completion/testData/basic/custom/TopLevelNonImportedExtFun.kt");