org.jetbrains.kotlin.fir.analysis.checkers.syntax.FirCommaInWhenConditionChecker.kt Maven / Gradle / Ivy
/*
* Copyright 2010-2021 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.fir.analysis.checkers.syntax
import com.intellij.psi.PsiElement
import org.jetbrains.kotlin.KtSourceElement
import org.jetbrains.kotlin.KtNodeTypes
import org.jetbrains.kotlin.fir.analysis.checkers.context.CheckerContext
import org.jetbrains.kotlin.diagnostics.DiagnosticReporter
import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors
import org.jetbrains.kotlin.diagnostics.reportOn
import org.jetbrains.kotlin.fir.analysis.getChild
import org.jetbrains.kotlin.fir.expressions.FirWhenBranch
import org.jetbrains.kotlin.fir.expressions.FirWhenExpression
import org.jetbrains.kotlin.fir.expressions.impl.FirElseIfTrueCondition
import org.jetbrains.kotlin.lexer.KtTokens
object FirCommaInWhenConditionChecker : FirExpressionSyntaxChecker() {
override fun isApplicable(element: FirWhenExpression, source: KtSourceElement): Boolean {
return element.subject == null
}
override fun checkPsiOrLightTree(
element: FirWhenExpression,
source: KtSourceElement,
context: CheckerContext,
reporter: DiagnosticReporter
) {
for (branch in element.branches) {
if (branch.condition is FirElseIfTrueCondition) continue
checkCommaInBranchCondition(branch, context, reporter)
}
}
private fun checkCommaInBranchCondition(branch: FirWhenBranch, context: CheckerContext, reporter: DiagnosticReporter) {
val source = branch.source
if (source?.elementType == KtNodeTypes.WHEN_ENTRY && source?.getChild(KtTokens.COMMA, depth = 1) != null) {
reporter.reportOn(source, FirErrors.COMMA_IN_WHEN_CONDITION_WITHOUT_ARGUMENT, context)
}
}
}