org.jetbrains.kotlin.builtins.functions.BuiltInFictitiousFunctionClassFactory.kt Maven / Gradle / Ivy
/*
* Copyright 2010-2015 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.builtins.functions
import org.jetbrains.kotlin.builtins.BuiltInsPackageFragment
import org.jetbrains.kotlin.builtins.functions.FunctionClassDescriptor.Kind
import org.jetbrains.kotlin.descriptors.ClassDescriptor
import org.jetbrains.kotlin.descriptors.ModuleDescriptor
import org.jetbrains.kotlin.descriptors.deserialization.ClassDescriptorFactory
import org.jetbrains.kotlin.name.ClassId
import org.jetbrains.kotlin.name.FqName
import org.jetbrains.kotlin.name.Name
import org.jetbrains.kotlin.storage.StorageManager
/**
* Produces descriptors representing the fictitious classes for function types, such as kotlin.Function1 or kotlin.reflect.KFunction2.
*/
class BuiltInFictitiousFunctionClassFactory(
private val storageManager: StorageManager,
private val module: ModuleDescriptor
) : ClassDescriptorFactory {
private data class KindWithArity(val kind: Kind, val arity: Int)
companion object {
private fun parseClassName(className: String, packageFqName: FqName): KindWithArity? {
val kind = FunctionClassDescriptor.Kind.byClassNamePrefix(packageFqName, className) ?: return null
val prefix = kind.classNamePrefix
val arity = toInt(className.substring(prefix.length)) ?: return null
// TODO: validate arity, should be <= 255
return KindWithArity(kind, arity)
}
@JvmStatic
fun getFunctionalClassKind(className: String, packageFqName: FqName) =
parseClassName(className, packageFqName)?.kind
private fun toInt(s: String): Int? {
if (s.isEmpty()) return null
var result = 0
for (c in s) {
val d = c - '0'
if (d !in 0..9) return null
result = result * 10 + d
}
return result
}
}
override fun shouldCreateClass(packageFqName: FqName, name: Name): Boolean {
val string = name.asString()
return (string.startsWith("Function") || string.startsWith("KFunction")) // an optimization
&& parseClassName(string, packageFqName) != null
}
override fun createClass(classId: ClassId): ClassDescriptor? {
if (classId.isLocal || classId.isNestedClass) return null
val className = classId.relativeClassName.asString()
if ("Function" !in className) return null // An optimization
val packageFqName = classId.packageFqName
val (kind, arity) = parseClassName(className, packageFqName) ?: return null
// SuspendFunction$n can't be created by classId
if (kind == Kind.SuspendFunction) return null
val containingPackageFragment = module.getPackage(packageFqName).fragments.filterIsInstance().first()
return FunctionClassDescriptor(storageManager, containingPackageFragment, kind, arity)
}
override fun getAllContributedClassesIfPossible(packageFqName: FqName): Collection {
// We don't want to return 256 classes here since it would cause them to appear in every import list of every file
// and likely slow down compilation very much
return emptySet()
}
}