Only named parameters in completion when nothing else can be

compiler/frontend/src/org/jetbrains/jet/lang/psi/JetCallElement.java

@@ -16,6 +16,7 @@
 
 package org.jetbrains.jet.lang.psi;
 
+import kotlin.jvm.KotlinSignature;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
@@ -28,6 +29,7 @@ public interface JetCallElement extends JetElement {
     @Nullable
     JetValueArgumentList getValueArgumentList();
 
+    @KotlinSignature("fun getValueArguments(): List<out ValueArgument>")
     @NotNull
     List<? extends ValueArgument> getValueArguments();
 

idea/src/org/jetbrains/jet/plugin/completion/CompletionSession.kt

@@ -87,26 +87,28 @@ class BasicCompletionSession(configuration: CompletionSessionConfiguration,
     }
 
     private fun collectElements() {
-        if (jetReference != null && !isOnlyKeywordCompletion()) {
-            if (shouldRunOnlyTypeCompletion()) {
-                if (configuration.completeNonImportedDeclarations) {
-                    TypesCompletion(parameters, resolveSession, prefixMatcher).addAllTypes(collector)
+        if (!NamedParametersCompletion.isOnlyNamedParameterExpected(position)) {
+            if (jetReference != null && !isOnlyKeywordCompletion()) {
+                if (shouldRunOnlyTypeCompletion()) {
+                    if (configuration.completeNonImportedDeclarations) {
+                        TypesCompletion(parameters, resolveSession, prefixMatcher).addAllTypes(collector)
+                    }
+                    else {
+                        addReferenceVariants { isPartOfTypeDeclaration(it) }
+                        JavaCompletionContributor.advertiseSecondCompletion(position.getProject(), resultSet)
+                    }
                 }
                 else {
-                    addReferenceVariants { isPartOfTypeDeclaration(it) }
-                    JavaCompletionContributor.advertiseSecondCompletion(position.getProject(), resultSet)
+                    addReferenceVariants { true }
+
+                    addNonImported()
                 }
             }
-            else {
-                addReferenceVariants { true }
 
-                addNonImported()
-            }
+            KeywordCompletion().complete(parameters, collector)
         }
 
-        KeywordCompletion().complete(parameters, collector)
-
-        NamedParametersCompletion.complete(parameters, collector)
+        NamedParametersCompletion.complete(position, collector)
     }
 
     private fun addNonImported() {

idea/src/org/jetbrains/jet/plugin/completion/NamedParametersCompletion.kt

@@ -37,6 +37,7 @@ import com.intellij.psi.filters.OrFilter
 import com.intellij.psi.filters.ClassFilter
 import org.jetbrains.jet.plugin.util.FirstChildInParentFilter
 import org.jetbrains.jet.lang.psi.psiUtil.getCallNameExpression
+import com.intellij.psi.PsiElement
 
 object NamedParametersCompletion {
     private val positionFilter = AndFilter(
@@ -50,8 +51,22 @@ object NamedParametersCompletion {
             )
     )
 
-    public fun complete(parameters: CompletionParameters, collector: LookupElementsCollector) {
-        val position = parameters.getPosition()
+    public fun isOnlyNamedParameterExpected(position: PsiElement): Boolean {
+        if (!positionFilter.isAcceptable(position, position)) return false
+
+        val thisArgument = PsiTreeUtil.getParentOfType(position, javaClass<JetValueArgument>())!!
+
+        val callElement = PsiTreeUtil.getParentOfType(thisArgument, javaClass<JetCallElement>()) ?: return false
+
+        for (argument in callElement.getValueArguments()) {
+            if (argument.isNamed()) return true
+            if (argument == thisArgument) break
+        }
+
+        return false
+    }
+
+    public fun complete(position: PsiElement, collector: LookupElementsCollector) {
         if (!positionFilter.isAcceptable(position, position)) return
 
         val valueArgument = PsiTreeUtil.getParentOfType(position, javaClass<JetValueArgument>())!!

idea/testData/completion/basic/common/namedParameters/NotOnlyNamedParameters.kt

@@ -0,0 +1,9 @@
+fun foo(first: Int, second: Int, third: String) {
+}
+
+fun test(p: Int) = foo(12, <caret>, third = "")
+
+// EXIST: p
+// ABSENT: first
+// ABSENT: third
+// EXIST: second

idea/testData/completion/basic/common/namedParameters/OnlyNamedParameters.kt

@@ -0,0 +1,9 @@
+fun foo(first: Int, second: Int, third: String) {
+}
+
+fun test(p: Int) = foo(12, third = "", <caret>)
+
+// ABSENT: p
+// ABSENT: first
+// ABSENT: third
+// EXIST: second

idea/tests/org/jetbrains/jet/completion/JSBasicCompletionTestGenerated.java

@@ -553,6 +553,16 @@ public class JSBasicCompletionTestGenerated extends AbstractJSBasicCompletionTes
                 doTest("idea/testData/completion/basic/common/namedParameters/NoParamsFromUnapplicableOverload.kt");
             }
             
+            @TestMetadata("NotOnlyNamedParameters.kt")
+            public void testNotOnlyNamedParameters() throws Exception {
+                doTest("idea/testData/completion/basic/common/namedParameters/NotOnlyNamedParameters.kt");
+            }
+            
+            @TestMetadata("OnlyNamedParameters.kt")
+            public void testOnlyNamedParameters() throws Exception {
+                doTest("idea/testData/completion/basic/common/namedParameters/OnlyNamedParameters.kt");
+            }
+            
             @TestMetadata("WithParameterExpression.kt")
             public void testWithParameterExpression() throws Exception {
                 doTest("idea/testData/completion/basic/common/namedParameters/WithParameterExpression.kt");

idea/tests/org/jetbrains/jet/completion/JvmBasicCompletionTestGenerated.java

@@ -16,14 +16,17 @@
 
 package org.jetbrains.jet.completion;
 
+import junit.framework.Assert;
 import junit.framework.Test;
 import junit.framework.TestSuite;
+
+import java.io.File;
+import java.util.regex.Pattern;
 import org.jetbrains.jet.JetTestUtils;
 import org.jetbrains.jet.test.InnerTestClasses;
 import org.jetbrains.jet.test.TestMetadata;
 
-import java.io.File;
-import java.util.regex.Pattern;
+import org.jetbrains.jet.completion.AbstractJvmBasicCompletionTest;
 
 /** This class is generated by {@link org.jetbrains.jet.generators.tests.TestsPackage}. DO NOT MODIFY MANUALLY */
 @SuppressWarnings("all")
@@ -550,6 +553,16 @@ public class JvmBasicCompletionTestGenerated extends AbstractJvmBasicCompletionT
                 doTest("idea/testData/completion/basic/common/namedParameters/NoParamsFromUnapplicableOverload.kt");
             }
             
+            @TestMetadata("NotOnlyNamedParameters.kt")
+            public void testNotOnlyNamedParameters() throws Exception {
+                doTest("idea/testData/completion/basic/common/namedParameters/NotOnlyNamedParameters.kt");
+            }
+            
+            @TestMetadata("OnlyNamedParameters.kt")
+            public void testOnlyNamedParameters() throws Exception {
+                doTest("idea/testData/completion/basic/common/namedParameters/OnlyNamedParameters.kt");
+            }
+            
             @TestMetadata("WithParameterExpression.kt")
             public void testWithParameterExpression() throws Exception {
                 doTest("idea/testData/completion/basic/common/namedParameters/WithParameterExpression.kt");