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For each parameter unused: minor optimization / simplification

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Related to KT-22068
This commit is contained in:
Mikhail Glukhikh
2018-08-09 17:08:16 +03:00
parent 911f16845e
commit 88ac04001d
1 changed files with 8 additions and 9 deletions
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idea/src/org/jetbrains/kotlin/idea/inspections/ForEachParameterNotUsedInspection.kt
+8 -9
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@@ -33,18 +33,16 @@ class ForEachParameterNotUsedInspection : AbstractKotlinInspection() {
override fun buildVisitor(holder: ProblemsHolder, isOnTheFly: Boolean): PsiElementVisitor {
return callExpressionVisitor {
val calleeExpression = it.calleeExpression as? KtNameReferenceExpression ?: return@callExpressionVisitor
if (calleeExpression.getReferencedName() != FOREACH_NAME) return@callExpressionVisitor
val calleeExpression = it.calleeExpression as? KtNameReferenceExpression
if (calleeExpression?.getReferencedName() != FOREACH_NAME) return@callExpressionVisitor
val lambda = it.lambdaArguments.singleOrNull()?.getLambdaExpression()
if (lambda == null || lambda.functionLiteral.arrow != null) return@callExpressionVisitor
when (it.getCallableDescriptor()?.fqNameOrNull()) {
COLLECTIONS_FOREACH_FQNAME, SEQUENCES_FOREACH_FQNAME -> {
val lambda = it.lambdaArguments.singleOrNull()?.getLambdaExpression() ?: return@callExpressionVisitor
if (lambda.functionLiteral.arrow != null) return@callExpressionVisitor
val descriptor = lambda.analyze()[BindingContext.FUNCTION, lambda.functionLiteral] ?: return@callExpressionVisitor
val iterableParameter = descriptor.valueParameters.singleOrNull() ?: return@callExpressionVisitor
if (iterableParameter !is WithDestructuringDeclaration &&
lambda.bodyExpression?.usesDescriptor(iterableParameter) != true
) {
if (iterableParameter !is WithDestructuringDeclaration && !lambda.bodyExpression.usesDescriptor(iterableParameter)) {
holder.registerProblem(
calleeExpression,
"Loop parameter '${iterableParameter.getThisLabelName()}' is unused",
@@ -65,13 +63,14 @@ class ForEachParameterNotUsedInspection : AbstractKotlinInspection() {
val literal = callExpression.lambdaArguments.singleOrNull()?.getLambdaExpression()?.functionLiteral ?: return
val psiFactory = KtPsiFactory(project)
val newParameterList = psiFactory.createLambdaParameterList("_")
with (SpecifyExplicitLambdaSignatureIntention) {
with(SpecifyExplicitLambdaSignatureIntention) {
literal.setParameterListIfAny(psiFactory, newParameterList)
}
}
}
private fun KtBlockExpression.usesDescriptor(descriptor: VariableDescriptor): Boolean {
private fun KtBlockExpression?.usesDescriptor(descriptor: VariableDescriptor): Boolean {
if (this == null) return false
var used = false
acceptChildren(object : KtVisitorVoid() {
override fun visitKtElement(element: KtElement) {