New J2K: Add array operation conversion

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

@@ -54,6 +54,7 @@ object ConversionsRunner {
             +InstanceOfConversion()
             +ForConversion(context)
             +ForInConversion()
+            +ArrayOperationsConversion(context)
             +TypeMappingConversion(context)
 
             //Kotlin --> Kotlin conversions

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

@@ -0,0 +1,35 @@
+/*
+ * 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.
+ */
+
+/*
+ * 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.*
+import org.jetbrains.kotlin.j2k.tree.impl.JKExpressionStatementImpl
+import org.jetbrains.kotlin.j2k.tree.impl.JKFieldAccessExpressionImpl
+import org.jetbrains.kotlin.j2k.tree.impl.JKFieldSymbol
+import org.jetbrains.kotlin.j2k.tree.impl.JKKtThrowExpressionImpl
+
+
+class ArrayOperationsConversion(private val context: ConversionContext) : RecursiveApplicableConversionBase() {
+    override fun applyToElement(element: JKTreeElement): JKTreeElement {
+        if (element !is JKQualifiedExpression) return recurse(element)
+        val selector = element.selector as? JKFieldAccessExpression ?: return recurse(element)
+        if (element.receiver.type(context) !is JKJavaArrayType) return recurse(element)
+        if (selector.identifier.name == "length") {
+            val sizeCall =
+                    JKFieldAccessExpressionImpl(
+                        context.symbolProvider.provideByFqName("kotlin/Array.size")
+                    )
+            element.selector = sizeCall
+        }
+        return recurse(element)
+    }
+}