KT-21811 Convert string concatenation into multiline string (#2772)

New J2K: Convert string concatenation into multiline string

#KT-21811 Fixed

nj2k/nj2k-services/src/org/jetbrains/kotlin/nj2k/postProcessing/J2kPostProcessor.kt

@@ -6,7 +6,6 @@
 package org.jetbrains.kotlin.nj2k.postProcessing
 
 import com.intellij.openapi.diagnostic.Logger
-import com.intellij.openapi.editor.RangeMarker
 import com.intellij.openapi.progress.ProcessCanceledException
 import org.jetbrains.kotlin.diagnostics.Errors
 import org.jetbrains.kotlin.idea.caches.resolve.resolveImportReference
@@ -30,6 +29,7 @@ import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.nj2k.NewJ2kConverterContext
 import org.jetbrains.kotlin.nj2k.postProcessing.processings.*
 import org.jetbrains.kotlin.psi.*
+import org.jetbrains.kotlin.psi.psiUtil.parents
 
 class NewJ2kPostProcessor : PostProcessor {
     @Suppress("PrivatePropertyName")
@@ -221,7 +221,15 @@ private val inspectionLikePostProcessingGroup =
         RemoveForExpressionLoopParameterTypeProcessing(),
         intentionBasedProcessing(ReplaceMapGetOrDefaultIntention()),
         inspectionBasedProcessing(ReplaceGuardClauseWithFunctionCallInspection()),
-        inspectionBasedProcessing(SortModifiersInspection())
+        inspectionBasedProcessing(SortModifiersInspection()),
+        intentionBasedProcessing(ConvertToRawStringTemplateIntention()) { element ->
+            element.parents.none {
+                (it as? KtProperty)?.hasModifier(KtTokens.CONST_KEYWORD) == true
+            } && ConvertToStringTemplateIntention.buildReplacement(element).entries.any {
+                (it as? KtEscapeStringTemplateEntry)?.unescapedValue == "\n"
+            }
+        },
+        intentionBasedProcessing(IndentRawStringIntention())
     )
 
 

nj2k/testData/newJ2k/docComments/deprecatedDocTagWithMultiLineMessage.kt

@@ -1,2 +1,7 @@
-@Deprecated("Ph'nglui mglw'nafh\n" + "  Cthulhu R'lyeh wgah'nagl fhtagn.\n" + "  'In His House at R'lyeh\n" + "  Dead Cthulhu waits dreaming,\n" + "  yet He shall rise and His kingdom\n" + "  shall cover the Earth.'")
+@Deprecated("""Ph'nglui mglw'nafh
+  Cthulhu R'lyeh wgah'nagl fhtagn.
+  'In His House at R'lyeh
+  Dead Cthulhu waits dreaming,
+  yet He shall rise and His kingdom
+  shall cover the Earth.'""")
 class TestDeprecatedInJavadocWithMultilineMessage 

nj2k/testData/newJ2k/postProcessing/ConvertConcatenationToRawString.java

@@ -0,0 +1,5 @@
+public class Test {
+    String s = "asdf\n" +
+               "nadfadsf\n" +
+               "asdfasdf";
+}

nj2k/testData/newJ2k/postProcessing/ConvertConcatenationToRawString.kt

@@ -0,0 +1,7 @@
+class Test {
+    var s = """
+        asdf
+        nadfadsf
+        asdfasdf
+        """.trimIndent()
+}

nj2k/tests/org/jetbrains/kotlin/nj2k/NewJavaToKotlinConverterSingleFileTestGenerated.java

@@ -4176,6 +4176,11 @@ public class NewJavaToKotlinConverterSingleFileTestGenerated extends AbstractNew
             runTest("nj2k/testData/newJ2k/postProcessing/AnonymousObject.java");
         }
 
+        @TestMetadata("ConvertConcatenationToRawString.java")
+        public void testConvertConcatenationToRawString() throws Exception {
+            runTest("nj2k/testData/newJ2k/postProcessing/ConvertConcatenationToRawString.java");
+        }
+
         @TestMetadata("GetOperator.java")
         public void testGetOperator() throws Exception {
             runTest("nj2k/testData/newJ2k/postProcessing/GetOperator.java");