FIR IDE: extract completion groups to object

idea/idea-fir/src/org/jetbrains/kotlin/idea/completion/Completions.kt

@@ -0,0 +1,83 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.idea.completion
+
+import org.jetbrains.kotlin.idea.completion.context.*
+import org.jetbrains.kotlin.idea.completion.contributors.FirCompletionContributorFactory
+import org.jetbrains.kotlin.idea.completion.contributors.complete
+import org.jetbrains.kotlin.idea.frontend.api.KtAnalysisSession
+
+internal object Completions {
+    fun KtAnalysisSession.complete(
+        factory: FirCompletionContributorFactory,
+        positionContext: FirRawPositionCompletionContext,
+    ) {
+        when (positionContext) {
+            is FirExpressionNameReferencePositionContext -> {
+                complete(factory.keywordContributor(0), positionContext)
+                complete(factory.callableContributor(0), positionContext)
+                complete(factory.classifierContributor(0), positionContext)
+                complete(factory.packageCompletionContributor(1), positionContext)
+            }
+
+            is FirTypeNameReferencePositionContext -> {
+                complete(factory.classifierContributor(0), positionContext)
+                complete(factory.keywordContributor(1), positionContext)
+                complete(factory.packageCompletionContributor(2), positionContext)
+            }
+
+            is FirAnnotationTypeNameReferencePositionContext -> {
+                complete(factory.annotationsContributor(0), positionContext)
+                complete(factory.keywordContributor(1), positionContext)
+                complete(factory.packageCompletionContributor(2), positionContext)
+            }
+
+            is FirSuperTypeCallNameReferencePositionContext -> {
+                complete(factory.superEntryContributor(0), positionContext)
+            }
+
+            is FirImportDirectivePositionContext -> {
+                complete(factory.packageCompletionContributor(0), positionContext)
+                complete(factory.importDirectivePackageMembersContributor(0), positionContext)
+            }
+
+            is FirPackageDirectivePositionContext -> {
+                complete(factory.packageCompletionContributor(0), positionContext)
+            }
+
+            is FirTypeConstraintNameInWhereClausePositionContext -> {
+                complete(factory.typeParameterConstraintNameInWhereClauseContributor(0), positionContext)
+            }
+
+            is FirUnknownPositionContext -> {
+                complete(factory.keywordContributor(0), positionContext)
+            }
+
+            is FirClassifierNamePositionContext -> {
+                complete(factory.classifierNameContributor(0), positionContext)
+            }
+
+            is FirWithSubjectEntryPositionContext -> {
+                complete(factory.whenWithSubjectConditionContributor(0), positionContext)
+            }
+
+            is FirCallableReferencePositionContext -> {
+                complete(factory.classReferenceContributor(0), positionContext)
+                complete(factory.callableReferenceContributor(1), positionContext)
+                complete(factory.classifierReferenceContributor(1), positionContext)
+            }
+
+            is FirInfixCallPositionContext -> {
+                complete(factory.keywordContributor(0), positionContext)
+                complete(factory.infixCallableContributor(0), positionContext)
+            }
+
+            is FirIncorrectPositionContext -> {
+                // do nothing, completion is not supposed to be called here
+            }
+        }
+    }
+}

idea/idea-fir/src/org/jetbrains/kotlin/idea/completion/KotlinFirCompletionContributor.kt

@@ -77,70 +77,8 @@ private object KotlinFirCompletionProvider : CompletionProvider<CompletionParame
         positionContext: FirRawPositionCompletionContext,
     ) {
         val factory = FirCompletionContributorFactory(basicContext)
-
-        when (positionContext) {
-            is FirExpressionNameReferencePositionContext -> {
-                complete(factory.keywordContributor(1), positionContext)
-                complete(factory.callableContributor(1), positionContext)
-                complete(factory.classifierContributor(1), positionContext)
-                complete(factory.packageCompletionContributor(2), positionContext)
-            }
-
-            is FirTypeNameReferencePositionContext -> {
-                complete(factory.classifierContributor(0), positionContext)
-                complete(factory.keywordContributor(1), positionContext)
-                complete(factory.packageCompletionContributor(2), positionContext)
-            }
-
-            is FirAnnotationTypeNameReferencePositionContext -> {
-                complete(factory.annotationsContributor(0), positionContext)
-                complete(factory.keywordContributor(1), positionContext)
-                complete(factory.packageCompletionContributor(2), positionContext)
-            }
-
-            is FirSuperTypeCallNameReferencePositionContext -> {
-                complete(factory.superEntryContributor(0), positionContext)
-            }
-
-            is FirImportDirectivePositionContext -> {
-                complete(factory.packageCompletionContributor(0), positionContext)
-                complete(factory.importDirectivePackageMembersContributor(0), positionContext)
-            }
-
-            is FirPackageDirectivePositionContext -> {
-                complete(factory.packageCompletionContributor(0), positionContext)
-            }
-
-            is FirTypeConstraintNameInWhereClausePositionContext -> {
-                complete(factory.typeParameterConstraintNameInWhereClauseContributor(0), positionContext)
-            }
-
-            is FirUnknownPositionContext -> {
-                complete(factory.keywordContributor(0), positionContext)
-            }
-
-            is FirClassifierNamePositionContext -> {
-                complete(factory.classifierNameContributor(0), positionContext)
-            }
-
-            is FirWithSubjectEntryPositionContext -> {
-                complete(factory.whenWithSubjectConditionContributor(0), positionContext)
-            }
-
-            is FirCallableReferencePositionContext -> {
-                complete(factory.classReferenceContributor(0), positionContext)
-                complete(factory.callableReferenceContributor(1), positionContext)
-                complete(factory.classifierReferenceContributor(1), positionContext)
-            }
-
-            is FirInfixCallPositionContext -> {
-                complete(factory.keywordContributor(0), positionContext)
-                complete(factory.infixCallableContributor(0), positionContext)
-            }
-
-            is FirIncorrectPositionContext -> {
-                // do nothing, completion is not supposed to be called here
-            }
+        with(Completions) {
+            complete(factory, positionContext)
         }
     }