New J2K: Add init block

j2k/newSrc/org/jetbrains/kotlin/j2k/NewCodeBuilder.kt

@@ -184,6 +184,15 @@ class NewCodeBuilder {
             printer.printlnWithNoIndent()
         }
 
+        override fun visitKtInitDeclaration(ktInitDeclaration: JKKtInitDeclaration) {
+            if (ktInitDeclaration.block.statements.isNotEmpty()) {
+                printer.print("init ")
+                printer.block(multiline = true) {
+                    ktInitDeclaration.block.statements.forEach { it.accept(this) }
+                }
+            }
+        }
+
         override fun visitKtIsExpression(ktIsExpression: JKKtIsExpression) {
             ktIsExpression.expression.accept(this)
             printer.printWithNoIndent(" is ")

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

@@ -5,9 +5,9 @@
 
 package org.jetbrains.kotlin.j2k.conversions
 
+import org.jetbrains.kotlin.j2k.copyTree
 import org.jetbrains.kotlin.j2k.tree.*
-import org.jetbrains.kotlin.j2k.tree.impl.JKJavaFieldImpl
-import org.jetbrains.kotlin.j2k.tree.impl.JKNameIdentifierImpl
+import org.jetbrains.kotlin.j2k.tree.impl.*
 
 
 class FieldInitializersInPrimaryFromParamsConversion : TransformerBasedConversion() {
@@ -16,6 +16,8 @@ class FieldInitializersInPrimaryFromParamsConversion : TransformerBasedConversio
     }
 
     override fun visitKtPrimaryConstructor(ktPrimaryConstructor: JKKtPrimaryConstructor) {
+        val containingClass = ktPrimaryConstructor.parentOfType<JKClass>() ?: return
+        val removedStatements = mutableListOf<JKStatement>()
         for (constructorStatement in ktPrimaryConstructor.block.statements) {
             val assignmentExpression =
                 (constructorStatement as? JKExpressionStatement)?.expression as? JKJavaAssignmentExpression ?: continue
@@ -25,7 +27,6 @@ class FieldInitializersInPrimaryFromParamsConversion : TransformerBasedConversio
             val parameter =
                 (assignmentExpression.expression as? JKFieldAccessExpression)?.identifier?.target as? JKParameter ?: continue
             if (ktPrimaryConstructor.parameters.contains(parameter)) {
-                val containingClass = ktPrimaryConstructor.parentOfType<JKClass>() ?: continue
                 val fieldDeclaration = containingClass.declarationList.find {
                     (it as? JKField)?.name?.value == fieldTarget.name.value
                 } ?: continue
@@ -36,8 +37,14 @@ class FieldInitializersInPrimaryFromParamsConversion : TransformerBasedConversio
                     parameter.name = JKNameIdentifierImpl(fieldTarget.name.value)
                 }
                 somethingChanged = true
+                removedStatements += constructorStatement
             }
         }
+        ktPrimaryConstructor.block.statements -= removedStatements
+        if (ktPrimaryConstructor.block.statements.isNotEmpty()) {
+            ktPrimaryConstructor.block.detach(ktPrimaryConstructor)
+            containingClass.getOrCreateInitDeclaration().block = ktPrimaryConstructor.block
+        }
     }
 
     private fun JKJavaAssignmentExpression.smartField(): JKFieldAccessExpression? {

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

@@ -252,4 +252,17 @@ class JKKtIsExpressionImpl(expression: JKExpression, type: JKTypeElement) : JKKt
     override var expression by child(expression)
 
     override fun <R, D> accept(visitor: JKVisitor<R, D>, data: D): R = visitor.visitKtIsExpression(this, data)
+}
+
+class JKKtInitDeclarationImpl(block: JKBlock) : JKKtInitDeclaration, JKBranchElementBase() {
+    override var block: JKBlock by child(block)
+    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())
+    declarationList += newDeclaration
+    return newDeclaration
 }

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

@@ -79,4 +79,8 @@ interface JKKtValueWhenLabel : JKKtWhenLabel {
 interface JKKtIsExpression : JKExpression {
     var expression: JKExpression
     var type: JKTypeElement
+}
+
+interface JKKtInitDeclaration : JKDeclaration {
+    var block: JKBlock
 }

j2k/newSrc/org/jetbrains/kotlin/j2k/tree/visitors/JKVisitor.kt

@@ -89,4 +89,5 @@ interface JKVisitor<out R, in D> {
     fun visitKtElseWhenLabel(ktElseWhenLabel: JKKtElseWhenLabel, data: D): R = visitKtWhenLabel(ktElseWhenLabel, data)
     fun visitKtValueWhenLabel(ktValueWhenLabel: JKKtValueWhenLabel, data: D): R = visitKtWhenLabel(ktValueWhenLabel, data)
     fun visitKtIsExpression(ktIsExpression: JKKtIsExpression, data: D): R = visitExpression(ktIsExpression, data)
+    fun visitKtInitDeclaration(ktInitDeclaration: JKKtInitDeclaration, data: D): R = visitDeclaration(ktInitDeclaration, data)
 }

j2k/newSrc/org/jetbrains/kotlin/j2k/tree/visitors/JKVisitorVoid.kt

@@ -175,4 +175,6 @@ interface JKVisitorVoid : JKVisitor<Unit, Nothing?> {
     override fun visitKtValueWhenLabel(ktValueWhenLabel: JKKtValueWhenLabel, data: Nothing?) = visitKtValueWhenLabel(ktValueWhenLabel)
     fun visitKtIsExpression(ktIsExpression: JKKtIsExpression) = visitExpression(ktIsExpression, null)
     override fun visitKtIsExpression(ktIsExpression: JKKtIsExpression, data: Nothing?) = visitKtIsExpression(ktIsExpression)
+    fun visitKtInitDeclaration(ktInitDeclaration: JKKtInitDeclaration) = visitDeclaration(ktInitDeclaration, null)
+    override fun visitKtInitDeclaration(ktInitDeclaration: JKKtInitDeclaration, data: Nothing?) = visitKtInitDeclaration(ktInitDeclaration)
 }