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/*
* Copyright 2010-2016 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.resolve
import org.jetbrains.kotlin.descriptors.*
import org.jetbrains.kotlin.resolve.OverridingUtil.OverrideCompatibilityInfo
object DescriptorEquivalenceForOverrides {
fun areEquivalent(a: DeclarationDescriptor?, b: DeclarationDescriptor?): Boolean {
return when {
a is ClassDescriptor &&
b is ClassDescriptor -> areClassesEquivalent(a, b)
a is TypeParameterDescriptor &&
b is TypeParameterDescriptor -> areTypeParametersEquivalent(a, b)
a is CallableDescriptor &&
b is CallableDescriptor -> areCallableDescriptorsEquivalent(a, b)
a is PackageFragmentDescriptor &&
b is PackageFragmentDescriptor -> (a).fqName == (b).fqName
else -> a == b
}
}
private fun areClassesEquivalent(a: ClassDescriptor, b: ClassDescriptor): Boolean {
// type constructors are compared by fqName
return a.typeConstructor == b.typeConstructor
}
private fun areTypeParametersEquivalent(
a: TypeParameterDescriptor,
b: TypeParameterDescriptor,
equivalentCallables: (DeclarationDescriptor?, DeclarationDescriptor?) -> Boolean = { _, _ -> false}
): Boolean {
if (a == b) return true
if (a.containingDeclaration == b.containingDeclaration) return false
if (!ownersEquivalent(a, b, equivalentCallables)) return false
return a.index == b.index // We ignore type parameter names
}
fun areCallableDescriptorsEquivalent(
a: CallableDescriptor,
b: CallableDescriptor,
ignoreReturnType: Boolean = false
): Boolean {
if (a == b) return true
if (a.name != b.name) return false
if (a.containingDeclaration == b.containingDeclaration) return false
// Distinct locals are not equivalent
if (DescriptorUtils.isLocal(a) || DescriptorUtils.isLocal(b)) return false
if (!ownersEquivalent(a, b, { _, _ -> false})) return false
val overridingUtil = OverridingUtil.createWithEqualityAxioms eq@ {
c1, c2 ->
if (c1 == c2) return@eq true
val d1 = c1.declarationDescriptor
val d2 = c2.declarationDescriptor
if (d1 !is TypeParameterDescriptor || d2 !is TypeParameterDescriptor) return@eq false
areTypeParametersEquivalent(d1, d2, {x, y -> x == a && y == b})
}
return overridingUtil.isOverridableBy(a, b, null, !ignoreReturnType).result == OverrideCompatibilityInfo.Result.OVERRIDABLE
&& overridingUtil.isOverridableBy(b, a, null, !ignoreReturnType).result == OverrideCompatibilityInfo.Result.OVERRIDABLE
}
private fun ownersEquivalent(
a: DeclarationDescriptor,
b: DeclarationDescriptor,
equivalentCallables: (DeclarationDescriptor?, DeclarationDescriptor?) -> Boolean
): Boolean {
val aOwner = a.containingDeclaration
val bOwner = b.containingDeclaration
// This check is needed when we call areTypeParametersEquivalent() from areCallableMemberDescriptorsEquivalent:
// if the type parameter owners are, e.g., functions, we'll go into infinite recursion here
if (aOwner is CallableMemberDescriptor || bOwner is CallableMemberDescriptor) {
return equivalentCallables(aOwner, bOwner)
}
else {
return areEquivalent(aOwner, bOwner)
}
}
}
