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/*
* 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.types.checker
import org.jetbrains.kotlin.builtins.KotlinBuiltIns
import org.jetbrains.kotlin.descriptors.ClassDescriptor
import org.jetbrains.kotlin.descriptors.TypeAliasDescriptor
import org.jetbrains.kotlin.resolve.OverridingUtil
import org.jetbrains.kotlin.resolve.calls.inference.CapturedType
import org.jetbrains.kotlin.resolve.calls.inference.CapturedTypeConstructorImpl
import org.jetbrains.kotlin.resolve.constants.IntegerLiteralTypeConstructor
import org.jetbrains.kotlin.resolve.constants.IntegerValueTypeConstructor
import org.jetbrains.kotlin.types.*
import org.jetbrains.kotlin.types.AbstractNullabilityChecker.hasNotNullSupertype
import org.jetbrains.kotlin.types.AbstractTypeCheckerContext.SupertypesPolicy
import org.jetbrains.kotlin.types.model.CaptureStatus
import org.jetbrains.kotlin.types.typeUtil.makeNullable
object SimpleClassicTypeSystemContext : ClassicTypeSystemContext
class ClassicTypeSystemContextImpl(override val builtIns: KotlinBuiltIns) : ClassicTypeSystemContext
object StrictEqualityTypeChecker {
/**
* String! != String & A != A, also A != A
* also A<*> != A
* different error types non-equals even errorTypeEqualToAnything
*/
fun strictEqualTypes(a: UnwrappedType, b: UnwrappedType): Boolean {
return AbstractStrictEqualityTypeChecker.strictEqualTypes(SimpleClassicTypeSystemContext, a, b)
}
fun strictEqualTypes(a: SimpleType, b: SimpleType): Boolean {
return AbstractStrictEqualityTypeChecker.strictEqualTypes(SimpleClassicTypeSystemContext, a, b)
}
}
object ErrorTypesAreEqualToAnything : KotlinTypeChecker {
override fun isSubtypeOf(subtype: KotlinType, supertype: KotlinType): Boolean =
NewKotlinTypeChecker.Default.run { ClassicTypeCheckerContext(true).isSubtypeOf(subtype.unwrap(), supertype.unwrap()) }
override fun equalTypes(a: KotlinType, b: KotlinType): Boolean =
NewKotlinTypeChecker.Default.run { ClassicTypeCheckerContext(true).equalTypes(a.unwrap(), b.unwrap()) }
}
interface NewKotlinTypeChecker : KotlinTypeChecker {
val kotlinTypeRefiner: KotlinTypeRefiner
val overridingUtil: OverridingUtil
fun transformToNewType(type: UnwrappedType): UnwrappedType
companion object {
val Default = NewKotlinTypeCheckerImpl(KotlinTypeRefiner.Default)
}
}
class NewKotlinTypeCheckerImpl(override val kotlinTypeRefiner: KotlinTypeRefiner) : NewKotlinTypeChecker {
override val overridingUtil: OverridingUtil = OverridingUtil.createWithTypeRefiner(kotlinTypeRefiner)
override fun isSubtypeOf(subtype: KotlinType, supertype: KotlinType): Boolean =
ClassicTypeCheckerContext(true, kotlinTypeRefiner = kotlinTypeRefiner)
.isSubtypeOf(subtype.unwrap(), supertype.unwrap()) // todo fix flag errorTypeEqualsToAnything
override fun equalTypes(a: KotlinType, b: KotlinType): Boolean =
ClassicTypeCheckerContext(false, kotlinTypeRefiner = kotlinTypeRefiner).equalTypes(a.unwrap(), b.unwrap())
fun ClassicTypeCheckerContext.equalTypes(a: UnwrappedType, b: UnwrappedType): Boolean {
return AbstractTypeChecker.equalTypes(this as AbstractTypeCheckerContext, a, b)
}
fun ClassicTypeCheckerContext.isSubtypeOf(subType: UnwrappedType, superType: UnwrappedType): Boolean {
return AbstractTypeChecker.isSubtypeOf(this as AbstractTypeCheckerContext, subType, superType)
}
fun transformToNewType(type: SimpleType): SimpleType {
val constructor = type.constructor
when (constructor) {
// Type itself can be just SimpleTypeImpl, not CapturedType. see KT-16147
is CapturedTypeConstructorImpl -> {
val lowerType = constructor.projection.takeIf { it.projectionKind == Variance.IN_VARIANCE }?.type?.unwrap()
// it is incorrect calculate this type directly because of recursive star projections
if (constructor.newTypeConstructor == null) {
constructor.newTypeConstructor =
NewCapturedTypeConstructor(constructor.projection, constructor.supertypes.map { it.unwrap() })
}
return NewCapturedType(
CaptureStatus.FOR_SUBTYPING, constructor.newTypeConstructor!!,
lowerType, type.annotations, type.isMarkedNullable
)
}
is IntegerValueTypeConstructor -> {
val newConstructor =
IntersectionTypeConstructor(constructor.supertypes.map { TypeUtils.makeNullableAsSpecified(it, type.isMarkedNullable) })
return KotlinTypeFactory.simpleTypeWithNonTrivialMemberScope(
type.annotations,
newConstructor,
listOf(),
false,
type.memberScope
)
}
is IntersectionTypeConstructor -> if (type.isMarkedNullable) {
val newConstructor = constructor.transformComponents(transform = { it.makeNullable() }) ?: constructor
return newConstructor.createType()
}
}
return type
}
override fun transformToNewType(type: UnwrappedType): UnwrappedType =
when (type) {
is SimpleType -> transformToNewType(type)
is FlexibleType -> {
val newLower = transformToNewType(type.lowerBound)
val newUpper = transformToNewType(type.upperBound)
if (newLower !== type.lowerBound || newUpper !== type.upperBound) {
KotlinTypeFactory.flexibleType(newLower, newUpper)
} else {
type
}
}
}.inheritEnhancement(type)
}
object NullabilityChecker {
fun isSubtypeOfAny(type: UnwrappedType): Boolean =
SimpleClassicTypeSystemContext
.newBaseTypeCheckerContext(errorTypesEqualToAnything = false, stubTypesEqualToAnything = true)
.hasNotNullSupertype(type.lowerIfFlexible(), SupertypesPolicy.LowerIfFlexible)
}
fun UnwrappedType.hasSupertypeWithGivenTypeConstructor(typeConstructor: TypeConstructor) =
ClassicTypeCheckerContext(false).anySupertype(lowerIfFlexible(), {
require(it is SimpleType)
it.constructor == typeConstructor
}, { SupertypesPolicy.LowerIfFlexible })
fun UnwrappedType.anySuperTypeConstructor(predicate: (TypeConstructor) -> Boolean) =
ClassicTypeCheckerContext(false).anySupertype(lowerIfFlexible(), {
require(it is SimpleType)
predicate(it.constructor)
}, { SupertypesPolicy.LowerIfFlexible })
/**
* ClassType means that type constructor for this type is type for real class or interface
*/
val SimpleType.isClassType: Boolean get() = constructor.declarationDescriptor is ClassDescriptor
/**
* SingleClassifierType is one of the following types:
* - classType
* - type for type parameter
* - captured type
*
* Such types can contains error types in our arguments, but type constructor isn't errorTypeConstructor
*/
val SimpleType.isSingleClassifierType: Boolean
get() = !isError &&
constructor.declarationDescriptor !is TypeAliasDescriptor &&
(constructor.declarationDescriptor != null || this is CapturedType || this is NewCapturedType || this is DefinitelyNotNullType)
val SimpleType.isIntersectionType: Boolean
get() = constructor is IntersectionTypeConstructor
val SimpleType.isIntegerLiteralType: Boolean
get() = constructor is IntegerLiteralTypeConstructor
