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KSFunctionDeclarationImpl.kt
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KSFunctionDeclarationImpl.kt
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/*
* Copyright 2020 Google LLC
* Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
*
* 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 com.google.devtools.ksp.symbol.impl.kotlin
import com.google.devtools.ksp.ExceptionMessage
import com.google.devtools.ksp.KSObjectCache
import com.google.devtools.ksp.memoized
import com.google.devtools.ksp.processing.impl.KSPCompilationError
import com.google.devtools.ksp.processing.impl.ResolverImpl
import com.google.devtools.ksp.symbol.*
import com.google.devtools.ksp.symbol.impl.*
import org.jetbrains.kotlin.descriptors.FunctionDescriptor
import org.jetbrains.kotlin.lexer.KtTokens
import org.jetbrains.kotlin.psi.KtConstructor
import org.jetbrains.kotlin.psi.KtFunction
import org.jetbrains.kotlin.psi.KtFunctionLiteral
import org.jetbrains.kotlin.psi.KtNamedFunction
import org.jetbrains.kotlin.psi.psiUtil.startOffset
import org.jetbrains.kotlin.resolve.calls.inference.returnTypeOrNothing
import org.jetbrains.kotlin.utils.addToStdlib.safeAs
class KSFunctionDeclarationImpl private constructor(val ktFunction: KtFunction) :
KSFunctionDeclaration,
KSDeclarationImpl(ktFunction),
KSExpectActual by KSExpectActualImpl(ktFunction) {
companion object : KSObjectCache<KtFunction, KSFunctionDeclarationImpl>() {
fun getCached(ktFunction: KtFunction) = cache.getOrPut(ktFunction) { KSFunctionDeclarationImpl(ktFunction) }
}
override fun findOverridee(): KSDeclaration? {
val descriptor = ResolverImpl.instance!!.resolveFunctionDeclaration(this)
return descriptor.safeAs<FunctionDescriptor>()?.findClosestOverridee()?.toKSDeclaration()
}
override val simpleName: KSName by lazy {
if (ktFunction is KtConstructor<*>) {
KSNameImpl.getCached("<init>")
} else {
if (ktFunction.name == null) {
throw KSPCompilationError(
ktFunction.containingFile,
ktFunction.startOffset,
"Function declaration must have a name"
)
}
KSNameImpl.getCached(ktFunction.name!!)
}
}
override val declarations: Sequence<KSDeclaration> by lazy {
if (!ktFunction.hasBlockBody()) {
emptySequence()
} else {
ktFunction.bodyBlockExpression?.statements?.asSequence()?.getKSDeclarations()?.memoized() ?: emptySequence()
}
}
override val extensionReceiver: KSTypeReference? by lazy {
if (ktFunction.receiverTypeReference != null) {
KSTypeReferenceImpl.getCached(ktFunction.receiverTypeReference!!)
} else {
null
}
}
override val functionKind: FunctionKind by lazy {
if (parentDeclaration == null) {
FunctionKind.TOP_LEVEL
} else {
when (ktFunction) {
is KtNamedFunction, is KtConstructor<*> -> FunctionKind.MEMBER
is KtFunctionLiteral -> if (ktFunction.node.findChildByType(KtTokens.FUN_KEYWORD) != null)
FunctionKind.ANONYMOUS else FunctionKind.LAMBDA
else -> throw IllegalStateException("Unexpected psi type ${ktFunction.javaClass}, $ExceptionMessage")
}
}
}
override val isAbstract: Boolean by lazy {
this.modifiers.contains(Modifier.ABSTRACT) ||
(
(this.parentDeclaration as? KSClassDeclaration)?.classKind == ClassKind.INTERFACE &&
!this.ktFunction.hasBody()
)
}
override val parameters: List<KSValueParameter> by lazy {
ktFunction.valueParameters.map { KSValueParameterImpl.getCached(it) }
}
override val returnType: KSTypeReference by lazy {
if (ktFunction.typeReference != null) {
KSTypeReferenceImpl.getCached(ktFunction.typeReference!!)
} else {
KSTypeReferenceDeferredImpl.getCached(this) {
val desc = ResolverImpl.instance!!.resolveDeclaration(ktFunction) as FunctionDescriptor
getKSTypeCached(desc.returnTypeOrNothing)
}
}
}
override fun <D, R> accept(visitor: KSVisitor<D, R>, data: D): R {
return visitor.visitFunctionDeclaration(this, data)
}
override fun asMemberOf(containing: KSType): KSFunction =
ResolverImpl.instance!!.asMemberOf(this, containing)
}