compiler-plugin/src/main/kotlin/com/google/devtools/ksp/symbol/impl/binary/KSDeclarationDescriptorImpl.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.binary

import com.google.devtools.ksp.memoized
import com.google.devtools.ksp.processing.impl.KSNameImpl
import com.google.devtools.ksp.symbol.*
import org.jetbrains.kotlin.backend.common.serialization.findPackage
import org.jetbrains.kotlin.descriptors.ClassDescriptor
import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
import org.jetbrains.kotlin.descriptors.FunctionDescriptor
import org.jetbrains.kotlin.load.java.descriptors.JavaClassDescriptor
import org.jetbrains.kotlin.resolve.descriptorUtil.fqNameSafe
import org.jetbrains.kotlin.resolve.descriptorUtil.parents
import org.jetbrains.kotlin.resolve.descriptorUtil.parentsWithSelf
import org.jetbrains.kotlin.utils.addToStdlib.firstIsInstanceOrNull

abstract class KSDeclarationDescriptorImpl(private val descriptor: DeclarationDescriptor) : KSDeclaration {

    override val origin by lazy {
        descriptor.origin
    }

    override val containingFile: KSFile? = null

    override val location: Location = NonExistLocation

    override val annotations: Sequence<KSAnnotation> by lazy {
        descriptor.annotations.asSequence().map { KSAnnotationDescriptorImpl.getCached(it, this) }.memoized()
    }

    override val parentDeclaration: KSDeclaration? by lazy {
        val containingDescriptor = descriptor.parents.first()
        when (containingDescriptor) {
            is ClassDescriptor -> KSClassDeclarationDescriptorImpl.getCached(containingDescriptor)
            is FunctionDescriptor -> KSFunctionDeclarationDescriptorImpl.getCached(containingDescriptor)
            else -> null
        } as KSDeclaration?
    }

    override val parent: KSNode? by lazy {
        parentDeclaration
    }

    override val packageName: KSName by lazy {
        KSNameImpl.getCached(descriptor.findPackage().fqName.asString())
    }

    override val qualifiedName: KSName by lazy {
        KSNameImpl.getCached(descriptor.fqNameSafe.asString())
    }

    override val simpleName: KSName by lazy {
        KSNameImpl.getCached(descriptor.name.asString())
    }

    override fun toString(): String {
        return this.simpleName.asString()
    }

    override val docString = null
}

val DeclarationDescriptor.origin: Origin
    get() = if (parentsWithSelf.firstIsInstanceOrNull<JavaClassDescriptor>() != null) {
        Origin.JAVA_LIB
    } else {
        Origin.KOTLIN_LIB
    }