/*
* Copyright 2000-2018 JetBrains s.r.o. 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.resolve.calls.checkers
import com.intellij.psi.PsiElement
import org.jetbrains.kotlin.diagnostics.Errors
import org.jetbrains.kotlin.psi.Call
import org.jetbrains.kotlin.psi.KtBinaryExpression
import org.jetbrains.kotlin.psi.KtLambdaExpression
import org.jetbrains.kotlin.psi.KtSimpleNameExpression
import org.jetbrains.kotlin.resolve.calls.callResolverUtil.isInfixCall
import org.jetbrains.kotlin.resolve.calls.callUtil.isCallableReference
import org.jetbrains.kotlin.resolve.calls.model.ResolvedCall
import org.jetbrains.kotlin.resolve.descriptorUtil.fqNameOrNull
import org.jetbrains.kotlin.serialization.deserialization.KOTLIN_SUSPEND_BUILT_IN_FUNCTION_FQ_NAME
import org.jetbrains.kotlin.utils.addToStdlib.safeAs
object LambdaWithSuspendModifierCallChecker : CallChecker {
override fun check(resolvedCall: ResolvedCall<*>, reportOn: PsiElement, context: CallCheckerContext) {
val descriptor = resolvedCall.candidateDescriptor
val call = resolvedCall.call
val callName = call.referencedName()
if (callName != "suspend" && descriptor.name.asString() != "suspend") return
when (descriptor.fqNameOrNull()) {
KOTLIN_SUSPEND_BUILT_IN_FUNCTION_FQ_NAME -> {
if (!call.hasFormOfSuspendModifierForLambda() || call.explicitReceiver != null) {
context.trace.report(Errors.NON_MODIFIER_FORM_FOR_BUILT_IN_SUSPEND.on(reportOn))
}
}
else -> {
if (call.hasFormOfSuspendModifierForLambda()) {
context.trace.report(Errors.MODIFIER_FORM_FOR_NON_BUILT_IN_SUSPEND.on(reportOn))
}
}
}
}
private fun Call.hasFormOfSuspendModifierForLambda() =
referencedName() == "suspend"
&& !isCallableReference()
&& typeArguments.isEmpty()
&& (hasNoArgumentListButDanglingLambdas() || isInfixWithRightLambda())
private fun Call.referencedName() =
calleeExpression?.safeAs<KtSimpleNameExpression>()?.getReferencedName()
private fun Call.hasNoArgumentListButDanglingLambdas() =
valueArgumentList?.leftParenthesis == null && functionLiteralArguments.isNotEmpty()
private fun Call.isInfixWithRightLambda() =
isInfixCall(this)
&& callElement.safeAs<KtBinaryExpression>()?.right is KtLambdaExpression
}