New J2K: consider in-context declarations while performing conversion on copy-paste plain text conversion

#KT-32602 fixed

idea/src/org/jetbrains/kotlin/idea/conversion/copy/ConvertJavaCopyPasteProcessor.kt

@@ -47,10 +47,7 @@ import org.jetbrains.kotlin.idea.util.module
 import org.jetbrains.kotlin.j2k.*
 import org.jetbrains.kotlin.lexer.KtTokens
 import org.jetbrains.kotlin.name.FqName
-import org.jetbrains.kotlin.psi.KtFile
+import org.jetbrains.kotlin.psi.*
-import org.jetbrains.kotlin.psi.KtPsiFactory
-import org.jetbrains.kotlin.psi.KtStringTemplateEntryWithExpression
-import org.jetbrains.kotlin.psi.KtStringTemplateExpression
 import org.jetbrains.kotlin.psi.psiUtil.endOffset
 import org.jetbrains.kotlin.psi.psiUtil.parentsWithSelf
 import java.awt.datatransfer.Transferable

idea/src/org/jetbrains/kotlin/idea/conversion/copy/ConvertTextJavaCopyPasteProcessor.kt

@@ -51,6 +51,7 @@ import kotlin.system.measureTimeMillis
 
 class ConvertTextJavaCopyPasteProcessor : CopyPastePostProcessor<TextBlockTransferableData>() {
     private val LOG = Logger.getInstance(ConvertTextJavaCopyPasteProcessor::class.java)
+    private val javaContextDeclarationRenderer = JavaContextDeclarationRenderer()
 
     private class MyTransferableData(val text: String) : TextBlockTransferableData {
 
@@ -247,9 +248,10 @@ class ConvertTextJavaCopyPasteProcessor : CopyPastePostProcessor<TextBlockTransf
     }
 
     private fun prepareCopiedJavaCodeByContext(text: String, context: JavaContext, target: KtElement): CopiedJavaCode {
-
         val targetFile = target.containingFile as KtFile
 
+        val (localDeclarations, memberDeclarations) = javaContextDeclarationRenderer.render(target)
+
         val prefix = buildString {
             targetFile.packageDirective?.let {
                 if (it.text.isNotEmpty()) {
@@ -279,9 +281,10 @@ class ConvertTextJavaCopyPasteProcessor : CopyPastePostProcessor<TextBlockTransf
         return when (context) {
             JavaContext.TOP_LEVEL -> createCopiedJavaCode(prefix, "$", text)
 
-            JavaContext.CLASS_BODY -> createCopiedJavaCode(prefix, "$classDef {\n$\n}", text)
+            JavaContext.CLASS_BODY -> createCopiedJavaCode(prefix, "$classDef {\n$memberDeclarations $\n}", text)
 
-            JavaContext.IN_BLOCK -> createCopiedJavaCode(prefix, "$classDef {\nvoid foo() {\n$\n}\n}", text)
+            JavaContext.IN_BLOCK ->
+                createCopiedJavaCode(prefix, "$classDef {\n$memberDeclarations void foo() {\n$localDeclarations $\n}\n}", text)
 
             JavaContext.EXPRESSION -> createCopiedJavaCode(prefix, "$classDef {\nObject field = $\n}", text)
         }

idea/src/org/jetbrains/kotlin/idea/conversion/copy/DataForConversion.kt

@@ -29,15 +29,19 @@ import org.jetbrains.kotlin.psi.psiUtil.siblings
 import org.jetbrains.kotlin.idea.core.util.start
 import org.jetbrains.kotlin.idea.core.util.end
 import org.jetbrains.kotlin.idea.core.util.range
+import org.jetbrains.kotlin.psi.KtDeclaration
+import org.jetbrains.kotlin.types.KotlinType
 import java.util.*
 
+
+
 data class DataForConversion private constructor(
         val elementsAndTexts: ElementAndTextList /* list consisting of PsiElement's to convert and plain String's */,
         val importsAndPackage: String,
         val file: PsiJavaFile
 ) {
     companion object {
-        fun prepare(copiedCode: CopiedJavaCode, project: Project): DataForConversion  {
+        fun prepare(copiedCode: CopiedJavaCode, project: Project): DataForConversion {
             val startOffsets = copiedCode.startOffsets.clone()
             val endOffsets = copiedCode.endOffsets.clone()
             assert(startOffsets.size == endOffsets.size) { "Must have the same size" }
@@ -61,6 +65,7 @@ data class DataForConversion private constructor(
             return DataForConversion(elementsAndTexts, importsAndPackage, file)
         }
 
+
         private fun clipTextIfNeeded(file: PsiJavaFile, fileText: String, startOffsets: IntArray, endOffsets: IntArray): String? {
             val ranges = startOffsets.indices.map { TextRange(startOffsets[it], endOffsets[it]) }.sortedBy { it.start }
 

idea/src/org/jetbrains/kotlin/idea/conversion/copy/JavaContextDeclarationRenderer.kt

@@ -0,0 +1,125 @@
+/*
+ * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * 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.idea.conversion.copy
+
+import com.intellij.psi.util.parents
+import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.builtins.jvm.JavaToKotlinClassMap
+import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
+import org.jetbrains.kotlin.descriptors.FunctionDescriptor
+import org.jetbrains.kotlin.descriptors.VariableDescriptorWithAccessors
+import org.jetbrains.kotlin.idea.caches.resolve.resolveToDescriptorIfAny
+import org.jetbrains.kotlin.name.FqNameUnsafe
+import org.jetbrains.kotlin.psi.*
+import org.jetbrains.kotlin.psi.psiUtil.blockExpressionsOrSingle
+import org.jetbrains.kotlin.psi.psiUtil.getParentOfType
+import org.jetbrains.kotlin.resolve.descriptorUtil.fqNameUnsafe
+import org.jetbrains.kotlin.serialization.deserialization.descriptors.DeserializedMemberDescriptor
+import org.jetbrains.kotlin.types.KotlinType
+import org.jetbrains.kotlin.utils.addToStdlib.safeAs
+
+data class ContextDeclarations(
+    val localDeclarationsJavaStubs: String,
+    val memberDeclarationsJavaStubs: String
+)
+
+
+class JavaContextDeclarationRenderer {
+    private val KtElement.memberDeclarations
+        get() = parents()
+            .flatMap { declaration ->
+                when (declaration) {
+                    is KtClass -> declaration.resolveToDescriptorIfAny()
+                        ?.unsubstitutedMemberScope
+                        ?.getContributedDescriptors()
+                        ?.asSequence()
+                    is KtDeclarationContainer ->
+                        declaration.declarations.mapNotNull { it.resolveToDescriptorIfAny() }.asSequence()
+                    else -> null
+                } ?: emptySequence()
+            }.filter { member ->
+                member !is DeserializedMemberDescriptor
+                        && !member.name.isSpecial
+                        && member.name.asString() != "dummy"
+            }
+
+    private val KtElement.localDeclarations
+        get() = getParentOfType<KtDeclaration>(strict = false)
+            ?.safeAs<KtFunction>()
+            ?.bodyExpression
+            ?.blockExpressionsOrSingle()
+            ?.filterIsInstance<KtDeclaration>()
+            ?.mapNotNull { it.resolveToDescriptorIfAny() }
+            .orEmpty()
+
+    fun render(contextElement: KtElement): ContextDeclarations =
+        ContextDeclarations(
+            contextElement.localDeclarations.render(),
+            contextElement.memberDeclarations.render()
+        )
+
+    private fun Sequence<DeclarationDescriptor>.render() =
+        buildString {
+            for (member in this@render) {
+                renderJavaDeclaration(member)
+                appendln()
+            }
+        }
+
+
+    private fun StringBuilder.renderJavaDeclaration(declaration: DeclarationDescriptor) {
+        when (declaration) {
+            is VariableDescriptorWithAccessors -> {
+                renderType(declaration.type)
+                append(' ')
+                append(declaration.name.asString())
+                append(" = null;")
+            }
+            is FunctionDescriptor -> {
+                renderType(declaration.returnType)
+                append(' ')
+                append(declaration.name.asString())
+                append('(')
+                for ((i, parameter) in declaration.valueParameters.withIndex()) {
+                    renderType(parameter.type)
+                    append(' ')
+                    append(parameter.name.asString())
+                    if (i != declaration.valueParameters.lastIndex) {
+                        append(", ")
+                    }
+                }
+                append(") {}")
+            }
+        }
+    }
+
+
+    private fun StringBuilder.renderType(type: KotlinType?) {
+        val fqName = type?.constructor?.declarationDescriptor?.fqNameUnsafe
+
+        if (fqName != null) {
+            renderFqName(fqName)
+        } else {
+            append("Object")
+        }
+        if (!type?.arguments.isNullOrEmpty()) {
+            append("<")
+            for (typeArgument in type!!.arguments) {
+                renderType(typeArgument.type)
+            }
+            append(">")
+        }
+    }
+
+    private fun StringBuilder.renderFqName(fqName: FqNameUnsafe) {
+        val stringFqName = when (fqName) {
+            KotlinBuiltIns.FQ_NAMES.unit -> "void"
+            else -> JavaToKotlinClassMap.mapKotlinToJava(fqName)?.asSingleFqName() ?: fqName.asString()
+        }
+        append(stringFqName)
+    }
+
+}

nj2k/testData/copyPastePlainText/InClassContextProperty.expected.kt

@@ -0,0 +1,6 @@
+class A {
+    val str: String = TODO()
+    internal fun f() {
+        str.length
+    }
+}

nj2k/testData/copyPastePlainText/InClassContextProperty.to.kt

@@ -0,0 +1,4 @@
+class A {
+    val str: String = TODO()
+    <caret>
+}

nj2k/testData/copyPastePlainText/InClassContextProperty.txt

@@ -0,0 +1,3 @@
+void f() {
+    str.length();
+}

nj2k/testData/copyPastePlainText/LocalAndMemberConflict.expected.kt

@@ -0,0 +1,7 @@
+class Test {
+    val str: Int = 10
+    fun test() {
+        val str: String = ""
+        val len = str.length
+    }
+}

nj2k/testData/copyPastePlainText/LocalAndMemberConflict.to.kt

@@ -0,0 +1,7 @@
+class Test {
+    val str: Int = 10
+    fun test() {
+        val str: String = ""
+        <caret>
+    }
+}

nj2k/testData/copyPastePlainText/LocalAndMemberConflict.txt

@@ -0,0 +1 @@
+int len = str.length();

nj2k/testData/copyPastePlainText/LocalContextProperty.expected.kt

@@ -0,0 +1,4 @@
+fun test() {
+    val str: String = ""
+    val len = str.length
+}

nj2k/testData/copyPastePlainText/LocalContextProperty.to.kt

@@ -0,0 +1,4 @@
+fun test() {
+    val str: String = ""
+    <caret>
+}

nj2k/testData/copyPastePlainText/LocalContextProperty.txt

@@ -0,0 +1 @@
+int len = str.length();

nj2k/testData/copyPastePlainText/TopLevelContextProperty.expected.kt

@@ -0,0 +1,4 @@
+val str: String = TODO()
+internal fun f() {
+    str.length
+}

nj2k/testData/copyPastePlainText/TopLevelContextProperty.to.kt

@@ -0,0 +1,2 @@
+val str: String = TODO()
+<caret>

nj2k/testData/copyPastePlainText/TopLevelContextProperty.txt

@@ -0,0 +1,3 @@
+void f() {
+    str.length();
+}

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

@@ -49,6 +49,11 @@ public class TextNewJavaToKotlinCopyPasteConversionTestGenerated extends Abstrac
         runTest("nj2k/testData/copyPastePlainText/ImportResolve.txt");
     }
 
+    @TestMetadata("InClassContextProperty.txt")
+    public void testInClassContextProperty() throws Exception {
+        runTest("nj2k/testData/copyPastePlainText/InClassContextProperty.txt");
+    }
+
     @TestMetadata("InsideIdentifier.txt")
     public void testInsideIdentifier() throws Exception {
         runTest("nj2k/testData/copyPastePlainText/InsideIdentifier.txt");
@@ -89,6 +94,16 @@ public class TextNewJavaToKotlinCopyPasteConversionTestGenerated extends Abstrac
         runTest("nj2k/testData/copyPastePlainText/KT32604.txt");
     }
 
+    @TestMetadata("LocalAndMemberConflict.txt")
+    public void testLocalAndMemberConflict() throws Exception {
+        runTest("nj2k/testData/copyPastePlainText/LocalAndMemberConflict.txt");
+    }
+
+    @TestMetadata("LocalContextProperty.txt")
+    public void testLocalContextProperty() throws Exception {
+        runTest("nj2k/testData/copyPastePlainText/LocalContextProperty.txt");
+    }
+
     @TestMetadata("MembersIntoClass.txt")
     public void testMembersIntoClass() throws Exception {
         runTest("nj2k/testData/copyPastePlainText/MembersIntoClass.txt");
@@ -119,6 +134,11 @@ public class TextNewJavaToKotlinCopyPasteConversionTestGenerated extends Abstrac
         runTest("nj2k/testData/copyPastePlainText/StatementsIntoFunction.txt");
     }
 
+    @TestMetadata("TopLevelContextProperty.txt")
+    public void testTopLevelContextProperty() throws Exception {
+        runTest("nj2k/testData/copyPastePlainText/TopLevelContextProperty.txt");
+    }
+
     @TestMetadata("WholeFile.txt")
     public void testWholeFile() throws Exception {
         runTest("nj2k/testData/copyPastePlainText/WholeFile.txt");