New J2K: Add temporary conversion for println calls

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

@@ -27,6 +27,7 @@ object ConversionsRunner {
         DefaultArgumentsConversion(context),
         TypeMappingConversion(context),
         FieldToPropertyConversion(),
+        PrintlnConversion(context),
         AssignmentAsExpressionToAlsoConversion(context),
         AssignmentStatementValCreationConversion(context),
         AssignmentStatementOperatorConversion(),

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

@@ -0,0 +1,45 @@
+/*
+ * 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.JKKtCallExpressionImpl
+import org.jetbrains.kotlin.j2k.tree.impl.JKMethodSymbol
+import org.jetbrains.kotlin.name.ClassId
+
+// TODO: Full special methods conversion
+class PrintlnConversion(private val context: ConversionContext) : RecursiveApplicableConversionBase() {
+    override fun applyToElement(element: JKTreeElement): JKTreeElement {
+        return if (element is JKQualifiedExpression) {
+            recurse(processQualified(element))
+        } else {
+            recurse(element)
+        }
+    }
+
+    private fun processQualified(element: JKQualifiedExpression): JKExpression {
+        val receiver = element.receiver as? JKQualifiedExpression ?: return element
+        val classReference = receiver.receiver as? JKClassAccessExpression ?: return element
+        if (classReference.identifier.fqName != "java.lang.System") return element
+        val fieldReference = receiver.selector as? JKFieldAccessExpression ?: return element
+        if (fieldReference.identifier.name != "out") return element
+        val selector = element.selector as? JKMethodCallExpression ?: return element
+        if (selector.identifier.name != "println") return element
+
+        val contextElement = element.parentOfType<JKClass>() ?: return element
+        val targetElements = multiResolveFqName(ClassId.fromString("kotlin/io/println"), context.backAnnotator(contextElement)!!)
+        if (targetElements.isEmpty()) return element
+        selector.invalidate()
+
+
+        return JKKtCallExpressionImpl(
+            context.symbolProvider.provideDirectSymbol(targetElements.first()) as JKMethodSymbol,
+            selector.arguments
+        )
+    }
+
+}

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

@@ -6,10 +6,12 @@
 package org.jetbrains.kotlin.j2k.conversions
 
 import com.intellij.psi.PsiElement
+import com.intellij.psi.PsiPolyVariantReference
 import org.jetbrains.kotlin.j2k.ConversionContext
 import org.jetbrains.kotlin.j2k.tree.JKTreeElement
 import org.jetbrains.kotlin.name.ClassId
 import org.jetbrains.kotlin.psi.KtDotQualifiedExpression
+import org.jetbrains.kotlin.psi.KtImportDirective
 import org.jetbrains.kotlin.psi.KtPsiFactory
 import org.jetbrains.kotlin.psi.analysisContext
 import org.jetbrains.kotlin.psi.psiUtil.getChildOfType
@@ -22,11 +24,25 @@ internal fun resolveFqName(classId: ClassId, contextElement: JKTreeElement, cont
 }
 
 internal fun resolveFqName(classId: ClassId, element: PsiElement): PsiElement? {
-    val importDirective = KtPsiFactory(element).createImportDirective(ImportPath(classId.asSingleFqName(), false))
-    importDirective.containingKtFile.analysisContext = element.containingFile
-    return importDirective.getChildOfType<KtDotQualifiedExpression>()
+    return constructImportDirectiveWithContext(classId, element)
+        .getChildOfType<KtDotQualifiedExpression>()
         ?.selectorExpression
         ?.let {
             it.references.mapNotNull { it.resolve() }.firstOrNull()
         }
+}
+
+private fun constructImportDirectiveWithContext(classId: ClassId, element: PsiElement): KtImportDirective {
+    val importDirective = KtPsiFactory(element).createImportDirective(ImportPath(classId.asSingleFqName(), false))
+    importDirective.containingKtFile.analysisContext = element.containingFile
+    return importDirective
+}
+
+internal fun multiResolveFqName(classId: ClassId, elementForContext: PsiElement): List<PsiElement> {
+    return constructImportDirectiveWithContext(classId, elementForContext)
+        .getChildOfType<KtDotQualifiedExpression>()
+        ?.selectorExpression
+        ?.let {
+            it.references.filterIsInstance<PsiPolyVariantReference>().flatMap { it.multiResolve(false).mapNotNull { it.element } }
+        }.orEmpty()
 }