/*
* Copyright 2010-2017 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jetbrains.kotlin.contracts.parsing.effects
import org.jetbrains.kotlin.contracts.description.EffectDeclaration
import org.jetbrains.kotlin.contracts.description.ReturnsEffectDeclaration
import org.jetbrains.kotlin.contracts.description.expressions.ConstantReference
import org.jetbrains.kotlin.contracts.parsing.*
import org.jetbrains.kotlin.diagnostics.Errors
import org.jetbrains.kotlin.psi.KtExpression
import org.jetbrains.kotlin.resolve.BindingTrace
import org.jetbrains.kotlin.resolve.calls.callUtil.getResolvedCall
internal class PsiReturnsEffectParser(
trace: BindingTrace,
contractParserDispatcher: PsiContractParserDispatcher
) : AbstractPsiEffectParser(trace, contractParserDispatcher) {
override fun tryParseEffect(expression: KtExpression): EffectDeclaration? {
val resolvedCall = expression.getResolvedCall(trace.bindingContext) ?: return null
val descriptor = resolvedCall.resultingDescriptor
if (descriptor.isReturnsNotNullDescriptor())
return ReturnsEffectDeclaration(ConstantReference.NOT_NULL)
if (!descriptor.isReturnsEffectDescriptor()) return null
val argumentExpression = resolvedCall.firstArgumentAsExpressionOrNull()
val constantValue = if (argumentExpression == null) {
ConstantReference.WILDCARD
} else {
// Note that we distinguish absence of an argument and unparsed argument
val constant = contractParserDispatcher.parseConstant(argumentExpression)
if (constant == null) {
trace.report(
Errors.ERROR_IN_CONTRACT_DESCRIPTION.on(
argumentExpression,
"only true/false/null constants in Returns-effect are currently supported"
)
)
return null
}
constant
}
return ReturnsEffectDeclaration(constantValue)
}
}