Support destructuring declarations in scratch files

#KT-25038 fixed

idea/idea-jvm/src/org/jetbrains/kotlin/idea/scratch/compile/KtScratchSourceFileProcessor.kt

@@ -21,6 +21,7 @@ import org.jetbrains.kotlin.diagnostics.rendering.RenderingContext
 import org.jetbrains.kotlin.idea.caches.resolve.resolveToDescriptorIfAny
 import org.jetbrains.kotlin.idea.scratch.ScratchExpression
 import org.jetbrains.kotlin.psi.*
+import org.jetbrains.kotlin.resolve.calls.util.isSingleUnderscore
 
 class KtScratchSourceFileProcessor {
     companion object {
@@ -71,6 +72,7 @@ class KtScratchSourceFileProcessor {
         fun process(expression: ScratchExpression) {
             val psiElement = expression.element
             when (psiElement) {
+                is KtDestructuringDeclaration -> processDestructuringDeclaration(expression, psiElement)
                 is KtVariableDeclaration -> processDeclaration(expression, psiElement)
                 is KtFunction -> processDeclaration(expression, psiElement)
                 is KtClassOrObject -> processDeclaration(expression, psiElement)
@@ -89,6 +91,23 @@ class KtScratchSourceFileProcessor {
             objectBuilder.appendLineInfo(e)
         }
 
+        private fun processDestructuringDeclaration(e: ScratchExpression, c: KtDestructuringDeclaration) {
+            val entries = c.entries.mapNotNull { if (it.isSingleUnderscore) null else it.resolveToDescriptorIfAny() }
+            entries.forEach {
+                val context = RenderingContext.of(it)
+                val rendered = Renderers.COMPACT.render(it, context)
+                classBuilder.append(rendered).newLine()
+                objectBuilder.println(rendered)
+            }
+            objectBuilder.appendLineInfo(e)
+            classBuilder.append("init {").newLine()
+            classBuilder.append(c.text).newLine()
+            entries.forEach {
+                classBuilder.append("this.${it.name} = ${it.name}").newLine()
+            }
+            classBuilder.append("}").newLine()
+        }
+
         private fun processExpression(e: ScratchExpression, expr: KtExpression) {
             val resName = "$GET_RES_FUN_NAME_PREFIX$resCount"
 

idea/scripting-support/test/org/jetbrains/kotlin/idea/scratch/ScratchRunActionTestGenerated.java

@@ -31,6 +31,11 @@ public class ScratchRunActionTestGenerated extends AbstractScratchRunActionTest
             KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("idea/scripting-support/testData/scratch"), Pattern.compile("^(.+)\\.kts$"), null, false);
         }
 
+        @TestMetadata("destructuringDecls.kts")
+        public void testDestructuringDecls() throws Exception {
+            runTest("idea/scripting-support/testData/scratch/destructuringDecls.kts");
+        }
+
         @TestMetadata("for.kts")
         public void testFor() throws Exception {
             runTest("idea/scripting-support/testData/scratch/for.kts");
@@ -119,6 +124,11 @@ public class ScratchRunActionTestGenerated extends AbstractScratchRunActionTest
             KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("idea/scripting-support/testData/scratch"), Pattern.compile("^(.+)\\.kts$"), null, false);
         }
 
+        @TestMetadata("destructuringDecls.kts")
+        public void testDestructuringDecls() throws Exception {
+            runTest("idea/scripting-support/testData/scratch/destructuringDecls.kts");
+        }
+
         @TestMetadata("for.kts")
         public void testFor() throws Exception {
             runTest("idea/scripting-support/testData/scratch/for.kts");

idea/scripting-support/testData/scratch/destructuringDecls.comp.after

@@ -0,0 +1,7 @@
+// REPL_MODE: false
+
+val (foo, bar) = 1 to "2"    // RESULT: val foo: Int; val bar: String
+foo                          // RESULT: 1
+bar                          // RESULT: 2
+val (_, baz) = 3 to "4"      // RESULT: val baz: String
+baz                          // RESULT: 4

idea/scripting-support/testData/scratch/destructuringDecls.kts

@@ -0,0 +1,7 @@
+// REPL_MODE: ~REPL_MODE~
+
+val (foo, bar) = 1 to "2"
+foo
+bar
+val (_, baz) = 3 to "4"
+baz

idea/scripting-support/testData/scratch/destructuringDecls.repl.after

@@ -0,0 +1,7 @@
+// REPL_MODE: true
+
+val (foo, bar) = 1 to "2"
+foo                          // RESULT: res1: kotlin.Int = 1
+bar                          // RESULT: res2: kotlin.String = 2
+val (_, baz) = 3 to "4"
+baz                          // RESULT: res4: kotlin.String = 4