org.jetbrains.kotlin.types.TypeCapabilities.kt Maven / Gradle / Ivy
/*
* 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.types
// To facilitate laziness, any KotlinType implementation may inherit from this trait,
// even if it turns out that the type an instance represents is not actually a type variable
// (i.e. it is not derived from a type parameter), see isTypeVariable
interface CustomTypeVariable {
val isTypeVariable: Boolean
// Throws an exception when isTypeVariable == false
fun substitutionResult(replacement: KotlinType): KotlinType
}
// That interface is needed to provide information about definitely not null
// type parameters (e.g. from @NotNull annotation) to type system
interface NotNullTypeVariable : CustomTypeVariable
fun KotlinType.isCustomTypeVariable(): Boolean = (unwrap() as? CustomTypeVariable)?.isTypeVariable ?: false
fun KotlinType.getCustomTypeVariable(): CustomTypeVariable? =
(unwrap() as? CustomTypeVariable)?.let {
if (it.isTypeVariable) it else null
}
interface SubtypingRepresentatives {
val subTypeRepresentative: KotlinType
val superTypeRepresentative: KotlinType
fun sameTypeConstructor(type: KotlinType): Boolean
}
fun KotlinType.getSubtypeRepresentative(): KotlinType =
(unwrap() as? SubtypingRepresentatives)?.subTypeRepresentative ?: this
fun KotlinType.getSupertypeRepresentative(): KotlinType =
(unwrap() as? SubtypingRepresentatives)?.superTypeRepresentative ?: this
fun sameTypeConstructors(first: KotlinType, second: KotlinType): Boolean {
return (first.unwrap() as? SubtypingRepresentatives)?.sameTypeConstructor(second) ?: false
|| (second.unwrap() as? SubtypingRepresentatives)?.sameTypeConstructor(first) ?: false
}