New J2K: Create init declaration from primary constructor in PrimaryConstructorDetectConversion

j2k/newSrc/org/jetbrains/kotlin/j2k/conversions/InsertDefaultPrimaryConstructorConversion.kt

@@ -19,7 +19,6 @@ class InsertDefaultPrimaryConstructorConversion(private val context: ConversionC
         val constructor = JKKtPrimaryConstructorImpl(
             JKNameIdentifierImpl(element.name.value),
             emptyList(),
-            JKBodyStub,
             JKStubExpressionImpl(),
             emptyList(),
             Visibility.PUBLIC,

j2k/newSrc/org/jetbrains/kotlin/j2k/conversions/PrimaryConstructorDetectConversion.kt

@@ -7,6 +7,7 @@ package org.jetbrains.kotlin.j2k.conversions
 
 import org.jetbrains.kotlin.j2k.ConversionContext
 import org.jetbrains.kotlin.j2k.tree.*
+import org.jetbrains.kotlin.j2k.tree.impl.JKKtInitDeclarationImpl
 import org.jetbrains.kotlin.j2k.tree.impl.JKKtPrimaryConstructorImpl
 
 class PrimaryConstructorDetectConversion(private val context: ConversionContext) : RecursiveApplicableConversionBase() {
@@ -17,6 +18,13 @@ class PrimaryConstructorDetectConversion(private val context: ConversionContext)
         return recurse(element)
     }
 
+    private fun <T> List<T>.replace(element: T, replacer: T): List<T> {
+        val mutableList = toMutableList()
+        val index = indexOf(element)
+        mutableList[index] = replacer
+        return mutableList
+    }
+
     private fun processClass(element: JKClass) {
         val constructors = element.declarationList.filterIsInstance<JKKtConstructor>()
         if (constructors.any { it is JKKtPrimaryConstructor }) return
@@ -24,15 +32,20 @@ class PrimaryConstructorDetectConversion(private val context: ConversionContext)
         val delegationCall = primaryConstructorCandidate.delegationCall as? JKDelegationConstructorCall
         if (delegationCall?.expression is JKThisExpression) return
 
-        element.classBody.declarations -= primaryConstructorCandidate
 
         primaryConstructorCandidate.invalidate()
+        if (primaryConstructorCandidate.block.statements.isNotEmpty()) {
+            val initDeclaration = JKKtInitDeclarationImpl(primaryConstructorCandidate.block)
+            element.classBody.declarations =
+                    element.classBody.declarations.replace(primaryConstructorCandidate, initDeclaration)
+        } else {
+            element.classBody.declarations -= primaryConstructorCandidate
+        }
 
         val primaryConstructor =
             JKKtPrimaryConstructorImpl(
                 primaryConstructorCandidate.name,
                 primaryConstructorCandidate.parameters,
-                primaryConstructorCandidate.block,
                 primaryConstructorCandidate.delegationCall,
                 primaryConstructorCandidate.extraModifiers,
                 primaryConstructorCandidate.visibility,

j2k/newSrc/org/jetbrains/kotlin/j2k/tree/impl/k.kt

@@ -192,7 +192,7 @@ class JKKtPrimaryConstructorImpl(
 
     override var name: JKNameIdentifier by child(name)
     override var parameters: List<JKParameter> by children(parameters)
-    override var block: JKBlock by child(block)
+    override var block: JKBlock by child(JKBodyStub)
     override var delegationCall: JKExpression by child(delegationCall)
     override var typeParameterList: JKTypeParameterList by child(JKTypeParameterListImpl())
     override var annotationList: JKAnnotationList by child(JKAnnotationListImpl())
@@ -238,14 +238,6 @@ class JKKtInitDeclarationImpl(block: JKBlock) : JKKtInitDeclaration, JKBranchEle
     override fun <R, D> accept(visitor: JKVisitor<R, D>, data: D): R = visitor.visitKtInitDeclaration(this, data)
 }
 
-fun JKClass.getOrCreateInitDeclaration(): JKKtInitDeclaration {
-    val existingDeclaration = declarationList.filterIsInstance<JKKtInitDeclaration>().firstOrNull()
-    if (existingDeclaration != null) return existingDeclaration
-    val newDeclaration = JKKtInitDeclarationImpl(JKBlockImpl())
-    classBody.declarations += newDeclaration
-    return newDeclaration
-}
-
 class JKKtOperatorExpressionImpl(
     receiver: JKExpression,
     override var identifier: JKMethodSymbol,