Correct handling of erroneous code during code extraction

compiler/frontend/src/org/jetbrains/kotlin/cfg/pseudocode/pseudocodeUtils.kt

@@ -27,7 +27,6 @@ import org.jetbrains.kotlin.cfg.pseudocode.instructions.jumps.ThrowExceptionInst
 import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.descriptors.impl.LocalVariableDescriptor
 import org.jetbrains.kotlin.psi.*
-import org.jetbrains.kotlin.psi.psiUtil.getElementTextWithContext
 import org.jetbrains.kotlin.psi.psiUtil.getNonStrictParentOfType
 import org.jetbrains.kotlin.psi.psiUtil.getStrictParentOfType
 import org.jetbrains.kotlin.psi.psiUtil.parents
@@ -287,20 +286,21 @@ fun Pseudocode.getElementValuesRecursively(element: KtElement): List<PseudoValue
     return results
 }
 
-fun KtElement.getContainingPseudocode(context: BindingContext): Pseudocode? {
-    val pseudocodeDeclaration =
-            PsiTreeUtil.getParentOfType(this, KtDeclarationWithBody::class.java, KtClassOrObject::class.java, KtScript::class.java)
-            ?: getNonStrictParentOfType<KtProperty>()
-            ?: return null
+val KtElement.containingDeclarationForPseudocode: KtDeclaration?
+        get() = PsiTreeUtil.getParentOfType(this, KtDeclarationWithBody::class.java, KtClassOrObject::class.java, KtScript::class.java)
+                ?: getNonStrictParentOfType<KtProperty>()
 
-    val enclosingPseudocodeDeclaration = (pseudocodeDeclaration as? KtFunctionLiteral)?.let {
+fun KtDeclaration.getContainingPseudocode(context: BindingContext): Pseudocode? {
+    val enclosingPseudocodeDeclaration = (this as? KtFunctionLiteral)?.let {
         it.parents.firstOrNull { it is KtDeclaration && it !is KtFunctionLiteral } as? KtDeclaration
-    } ?: pseudocodeDeclaration
+    } ?: this
 
     val enclosingPseudocode = PseudocodeUtil.generatePseudocode(enclosingPseudocodeDeclaration, context)
-    return enclosingPseudocode.getPseudocodeByElement(pseudocodeDeclaration)
+    return enclosingPseudocode.getPseudocodeByElement(this)
 }
 
+fun KtElement.getContainingPseudocode(context: BindingContext) = containingDeclarationForPseudocode?.getContainingPseudocode(context)
+
 fun Pseudocode.getPseudocodeByElement(element: KtElement): Pseudocode? {
     if (correspondingElement == element) return this
 

idea/src/org/jetbrains/kotlin/idea/debugger/evaluate/extractFunctionForDebuggerUtil.kt

@@ -56,6 +56,7 @@ fun getFunctionForExtractedFragment(
             val message = when(errorMessage) {
                 ErrorMessage.NO_EXPRESSION -> "Cannot perform an action without an expression"
                 ErrorMessage.NO_CONTAINER -> "Cannot perform an action at this breakpoint ${breakpointFile.name}:$breakpointLine"
+                ErrorMessage.SYNTAX_ERRORS -> "Cannot perform an action due to erroneous code"
                 ErrorMessage.SUPER_CALL -> "Cannot perform an action for expression with super call"
                 ErrorMessage.DENOTABLE_TYPES -> "Cannot perform an action because following types are unavailable from debugger scope"
                 ErrorMessage.ERROR_TYPES -> "Cannot perform an action because this code fragment contains erroneous types"

idea/src/org/jetbrains/kotlin/idea/refactoring/KotlinRefactoringBundle.properties

@@ -6,6 +6,7 @@ introduce.property=Introduce Property
 introduce.parameter=Introduce Parameter
 cannot.refactor.no.container=Cannot refactor in this place
 cannot.refactor.no.expression=Cannot perform refactoring without an expression
+cannot.refactor.syntax.errors=Cannot refactor due to erroneous code
 cannot.refactor.expression.has.unit.type=Cannot introduce expression of unit type
 cannot.refactor.package.expression=Cannot introduce package reference
 extract.function=Extract Function

idea/src/org/jetbrains/kotlin/idea/refactoring/introduce/extractionEngine/ExtractableCodeDescriptor.kt

@@ -505,6 +505,7 @@ class AnalysisResult (
     enum class ErrorMessage {
         NO_EXPRESSION,
         NO_CONTAINER,
+        SYNTAX_ERRORS,
         SUPER_CALL,
         DENOTABLE_TYPES,
         ERROR_TYPES,
@@ -526,6 +527,7 @@ class AnalysisResult (
                     when (this) {
                         NO_EXPRESSION -> "cannot.refactor.no.expression"
                         NO_CONTAINER -> "cannot.refactor.no.container"
+                        SYNTAX_ERRORS -> "cannot.refactor.syntax.errors"
                         SUPER_CALL -> "cannot.extract.super.call"
                         DENOTABLE_TYPES -> "parameter.types.are.not.denotable"
                         ERROR_TYPES -> "error.types.in.generated.function"

idea/src/org/jetbrains/kotlin/idea/refactoring/introduce/extractionEngine/extractableAnalysisUtil.kt

@@ -624,7 +624,9 @@ fun ExtractionData.performAnalysis(): AnalysisResult {
 
     val bindingContext = bindingContext ?: return noContainerError
 
-    val pseudocode = commonParent.getContainingPseudocode(bindingContext) ?: return noContainerError
+    val declaration = commonParent.containingDeclarationForPseudocode ?: return noContainerError
+    val pseudocode = declaration.getContainingPseudocode(bindingContext)
+                     ?: return AnalysisResult(null, Status.CRITICAL_ERROR, listOf(ErrorMessage.SYNTAX_ERRORS))
     val localInstructions = getLocalInstructions(pseudocode)
 
     val modifiedVarDescriptorsWithExpressions = localInstructions.getModifiedVarDescriptors(bindingContext)

idea/testData/refactoring/introduceProperty/syntaxErrors.kt

@@ -0,0 +1,8 @@
+// EXTRACTION_TARGET: property with getter
+
+fun doSomethingStrangeWithCollection(collection: Collection<String>): Collection<String>? {
+    val groupsByLength = collection.groupBy { s -> { s.length } }
+
+    val maximumSizeOfGroup = groupsByLength.values.maxBy { it.size }.
+            return groupsByLength.values.firstOrNull { group -> {<selection>group.size == maximumSizeOfGroup</selection>} }
+}

idea/testData/refactoring/introduceProperty/syntaxErrors.kt.conflicts

@@ -0,0 +1 @@
+Cannot refactor due to erroneous code

idea/tests/org/jetbrains/kotlin/idea/refactoring/introduce/ExtractionTestGenerated.java

@@ -3124,6 +3124,12 @@ public class ExtractionTestGenerated extends AbstractExtractionTest {
             doIntroducePropertyTest(fileName);
         }
 
+        @TestMetadata("syntaxErrors.kt")
+        public void testSyntaxErrors() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/refactoring/introduceProperty/syntaxErrors.kt");
+            doIntroducePropertyTest(fileName);
+        }
+
         @TestMetadata("typeParameterNotResolvableInTargetScope.kt")
         public void testTypeParameterNotResolvableInTargetScope() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("idea/testData/refactoring/introduceProperty/typeParameterNotResolvableInTargetScope.kt");