/*
* 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.
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package org.jetbrains.kotlin.contracts.model.functors
import org.jetbrains.kotlin.contracts.model.structure.ESCalls
import org.jetbrains.kotlin.contracts.model.structure.ESReturns
import org.jetbrains.kotlin.contracts.model.structure.ESConstant
import org.jetbrains.kotlin.contracts.model.ESValue
import org.jetbrains.kotlin.contracts.model.structure.ESVariable
import org.jetbrains.kotlin.contracts.model.ConditionalEffect
import org.jetbrains.kotlin.contracts.model.ESEffect
import org.jetbrains.kotlin.contracts.model.SimpleEffect
import org.jetbrains.kotlin.contracts.model.Computation
import org.jetbrains.kotlin.contracts.model.visitors.Substitutor
import org.jetbrains.kotlin.descriptors.FunctionDescriptor
import org.jetbrains.kotlin.descriptors.ValueDescriptor
import org.jetbrains.kotlin.utils.addIfNotNull
class SubstitutingFunctor(private val basicEffects: List<ESEffect>, private val ownerFunction: FunctionDescriptor) :
AbstractReducingFunctor() {
override fun doInvocation(arguments: List<Computation>): List<ESEffect> {
if (basicEffects.isEmpty()) return emptyList()
val receiver =
listOfNotNull(ownerFunction.dispatchReceiverParameter?.toESVariable(), ownerFunction.extensionReceiverParameter?.toESVariable())
val parameters = receiver + ownerFunction.valueParameters.map { it.toESVariable() }
assert(parameters.size == arguments.size) {
"Arguments and parameters size mismatch: arguments.size = ${arguments.size}, parameters.size = ${parameters.size}"
}
val substitutions = parameters.zip(arguments).toMap()
val substitutor = Substitutor(substitutions)
val substitutedClauses = mutableListOf<ESEffect>()
effectsLoop@ for (effect in basicEffects) {
when (effect) {
is ConditionalEffect -> effect.condition.accept(substitutor)?.effects?.forEach {
substitutedClauses.addIfNotNull(combine(effect.simpleEffect, it))
}
is ESCalls -> {
val subsitutionForCallable = substitutions[effect.callable] as? ESValue ?: continue@effectsLoop
substitutedClauses += ESCalls(subsitutionForCallable, effect.kind)
}
else -> substitutedClauses += effect
}
}
return substitutedClauses
}
private fun combine(effect: SimpleEffect, substitutedCondition: ESEffect): ESEffect? {
if (substitutedCondition !is ConditionalEffect) return null
val effectFromCondition = substitutedCondition.simpleEffect
if (effectFromCondition !is ESReturns || effectFromCondition.value == ESConstant.WILDCARD) return substitutedCondition
if (effectFromCondition.value != ESConstant.TRUE) return null
return ConditionalEffect(substitutedCondition.condition, effect)
}
private fun ValueDescriptor.toESVariable(): ESVariable = ESVariable(this)
}