diff --git a/j2k/newSrc/org/jetbrains/kotlin/j2k/ConversionsRunner.kt b/j2k/newSrc/org/jetbrains/kotlin/j2k/ConversionsRunner.kt
index 86769ee05bb..92e1cb9b711 100644
--- a/j2k/newSrc/org/jetbrains/kotlin/j2k/ConversionsRunner.kt
+++ b/j2k/newSrc/org/jetbrains/kotlin/j2k/ConversionsRunner.kt
@@ -21,34 +21,33 @@ import org.jetbrains.kotlin.j2k.tree.JKTreeElement
 
 object ConversionsRunner {
 
-    private fun createConversions(context: ConversionContext) = listOf(
-        ModalityConversion(context),
-        ImplicitInitializerConversion(),
-        DefaultArgumentsConversion(context),
-        TypeMappingConversion(context),
-        FieldToPropertyConversion(),
-        PrintlnConversion(context),
-        BlockToRunConversion(context),
-        AssignmentAsExpressionToAlsoConversion(context),
-        AssignmentStatementValCreationConversion(context),
-        AssignmentStatementOperatorConversion(),
-        ConstructorConversion(context),
-        PrimaryConstructorDetectConversion(context),
-        JavaMethodToKotlinFunctionConversion(),
-        LiteralConversion(),
-        InnerClassConversion(),
-        ModifiersConversion(context),
-        StaticsToCompanionExtractConversion(),
-        ClassToObjectPromotionConversion(),
-        PolyadicExpressionConversion(),
-        BinaryExpressionConversion()
-    )
+    private fun createRootConversion(context: ConversionContext) =
+        batchPipe {
+            +ModalityConversion(context)
+            +ImplicitInitializerConversion()
+            +DefaultArgumentsConversion(context)
+            +TypeMappingConversion(context)
+            +FieldToPropertyConversion()
+            +PrintlnConversion(context)
+            +BlockToRunConversion(context)
+            +AssignmentAsExpressionToAlsoConversion(context)
+            +AssignmentStatementValCreationConversion(context)
+            +AssignmentStatementOperatorConversion()
+            +ConstructorConversion(context)
+            +PrimaryConstructorDetectConversion(context)
+            +JavaMethodToKotlinFunctionConversion()
+            +LiteralConversion()
+            +InnerClassConversion()
+            +ModifiersConversion(context)
+            +StaticsToCompanionExtractConversion()
+            +ClassToObjectPromotionConversion()
+            +PolyadicExpressionConversion()
+            +BinaryExpressionConversion()
+        }
 
     fun doApply(trees: List<JKTreeElement>, context: ConversionContext) {
-        val conversions = createConversions(context)
-        trees.forEach { tree ->
-            conversions.forEach { it.runConversion(tree, context) }
-        }
+        val conversion = createRootConversion(context)
+        conversion.runConversion(trees, context)
     }
 
 }
\ No newline at end of file
diff --git a/j2k/newSrc/org/jetbrains/kotlin/j2k/conversions/BaseConversion.kt b/j2k/newSrc/org/jetbrains/kotlin/j2k/conversions/BaseConversion.kt
index e7697887878..a4bae1b9cf6 100644
--- a/j2k/newSrc/org/jetbrains/kotlin/j2k/conversions/BaseConversion.kt
+++ b/j2k/newSrc/org/jetbrains/kotlin/j2k/conversions/BaseConversion.kt
@@ -19,10 +19,14 @@ package org.jetbrains.kotlin.j2k.conversions
 import org.jetbrains.kotlin.j2k.ConversionContext
 import org.jetbrains.kotlin.j2k.tree.JKTreeElement
 
-abstract class BaseConversion {
-    /**
-     * @return true if something changed
-     */
-    abstract fun runConversion(treeRoot: JKTreeElement, context: ConversionContext): Boolean
+interface BatchBaseConversion {
+    fun runConversion(treeRoots: List<JKTreeElement>, context: ConversionContext): Boolean
+}
 
+interface SequentialBaseConversion : BatchBaseConversion {
+    fun runConversion(treeRoot: JKTreeElement, context: ConversionContext): Boolean
+
+    override fun runConversion(treeRoots: List<JKTreeElement>, context: ConversionContext): Boolean {
+        return treeRoots.asSequence().map { runConversion(it, context) }.max() ?: false
+    }
 }
\ No newline at end of file
diff --git a/j2k/newSrc/org/jetbrains/kotlin/j2k/conversions/CompositeConversion.kt b/j2k/newSrc/org/jetbrains/kotlin/j2k/conversions/CompositeConversion.kt
new file mode 100644
index 00000000000..30db324e473
--- /dev/null
+++ b/j2k/newSrc/org/jetbrains/kotlin/j2k/conversions/CompositeConversion.kt
@@ -0,0 +1,62 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. 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.j2k.conversions
+
+import org.jetbrains.kotlin.j2k.ConversionContext
+import org.jetbrains.kotlin.j2k.tree.JKTreeElement
+
+class BatchPipelineConversion(val conversions: List<BatchBaseConversion>) : BatchBaseConversion {
+    override fun runConversion(treeRoots: List<JKTreeElement>, context: ConversionContext): Boolean {
+        return conversions.asSequence().map { it.runConversion(treeRoots, context) }.max() ?: false
+    }
+}
+
+class SequentialPipelineConversion(val conversions: List<SequentialBaseConversion>) : SequentialBaseConversion {
+    override fun runConversion(treeRoot: JKTreeElement, context: ConversionContext): Boolean {
+        return conversions.asSequence().map { it.runConversion(treeRoot, context) }.max() ?: false
+    }
+}
+
+class BatchRepeatConversion(val conversion: BatchBaseConversion) : BatchBaseConversion {
+
+    override fun runConversion(treeRoots: List<JKTreeElement>, context: ConversionContext): Boolean {
+        return true in generateSequence { conversion.runConversion(treeRoots, context) }.takeWhile { it }
+    }
+
+}
+
+class SequentialRepeatConversion(val conversion: SequentialBaseConversion) : SequentialBaseConversion {
+    override fun runConversion(treeRoot: JKTreeElement, context: ConversionContext): Boolean {
+        return true in generateSequence { conversion.runConversion(treeRoot, context) }.takeWhile { it }
+    }
+
+}
+
+
+class PipelineConversionBuilder<T : BatchBaseConversion> {
+    val conversions = mutableListOf<T>()
+    operator fun T.unaryPlus() {
+        conversions += this
+    }
+}
+
+internal inline fun sequentialPipe(crossinline configure: PipelineConversionBuilder<SequentialBaseConversion>.() -> Unit): SequentialPipelineConversion {
+    return SequentialPipelineConversion(
+        PipelineConversionBuilder<SequentialBaseConversion>().apply(configure).conversions
+    )
+}
+
+internal inline fun batchPipe(crossinline configure: PipelineConversionBuilder<BatchBaseConversion>.() -> Unit): BatchPipelineConversion {
+    return BatchPipelineConversion(
+        PipelineConversionBuilder().apply(configure).conversions
+    )
+}
+internal inline fun batchRepeat(batchBaseConversion: BatchBaseConversion): BatchRepeatConversion {
+    return BatchRepeatConversion(batchBaseConversion)
+}
+internal inline fun sequentialRepeat(sequentialBaseConversion: SequentialBaseConversion): SequentialRepeatConversion {
+    return SequentialRepeatConversion(sequentialBaseConversion)
+}
diff --git a/j2k/newSrc/org/jetbrains/kotlin/j2k/conversions/MatchBasedConversion.kt b/j2k/newSrc/org/jetbrains/kotlin/j2k/conversions/MatchBasedConversion.kt
index 6bd340f4bfc..666f671c7f2 100644
--- a/j2k/newSrc/org/jetbrains/kotlin/j2k/conversions/MatchBasedConversion.kt
+++ b/j2k/newSrc/org/jetbrains/kotlin/j2k/conversions/MatchBasedConversion.kt
@@ -8,9 +8,9 @@ package org.jetbrains.kotlin.j2k.conversions
 import org.jetbrains.kotlin.j2k.tree.JKTreeElement
 import org.jetbrains.kotlin.j2k.tree.impl.JKBranchElementBase
 
-abstract class MatchBasedConversion : BaseConversion() {
+abstract class MatchBasedConversion : SequentialBaseConversion {
 
-    fun <T> applyRecursive(element: JKTreeElement, data: T, func: (JKTreeElement, T) -> JKTreeElement): JKTreeElement {
+    fun <R : JKTreeElement, T> applyRecursive(element: R, data: T, func: (JKTreeElement, T) -> JKTreeElement): R {
         if (element is JKBranchElementBase) {
             val iter = element.children.listIterator()
             while (iter.hasNext()) {
@@ -34,7 +34,7 @@ abstract class MatchBasedConversion : BaseConversion() {
         return element
     }
 
-    inline fun applyRecursive(element: JKTreeElement, crossinline func: (JKTreeElement) -> JKTreeElement): JKTreeElement {
+    inline fun <R : JKTreeElement> applyRecursive(element: R, crossinline func: (JKTreeElement) -> JKTreeElement): R {
         return applyRecursive(element, null) { it, _ -> func(it) }
     }
 
diff --git a/j2k/newSrc/org/jetbrains/kotlin/j2k/conversions/TransformerBasedConversion.kt b/j2k/newSrc/org/jetbrains/kotlin/j2k/conversions/TransformerBasedConversion.kt
index 08e6bcaaf36..b75d07b8f74 100644
--- a/j2k/newSrc/org/jetbrains/kotlin/j2k/conversions/TransformerBasedConversion.kt
+++ b/j2k/newSrc/org/jetbrains/kotlin/j2k/conversions/TransformerBasedConversion.kt
@@ -20,7 +20,7 @@ import org.jetbrains.kotlin.j2k.ConversionContext
 import org.jetbrains.kotlin.j2k.tree.JKTreeElement
 import org.jetbrains.kotlin.j2k.tree.visitors.JKVisitorVoid
 
-abstract class TransformerBasedConversion : BaseConversion(), JKVisitorVoid {
+abstract class TransformerBasedConversion : SequentialBaseConversion, JKVisitorVoid {
     protected var somethingChanged = false
 
     override fun runConversion(treeRoot: JKTreeElement, context: ConversionContext): Boolean {