/*
 * 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.js.resolve.diagnostics

import com.intellij.psi.PsiElement
import org.jetbrains.kotlin.descriptors.CallableMemberDescriptor
import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
import org.jetbrains.kotlin.descriptors.DeclarationDescriptorWithSource
import org.jetbrains.kotlin.resolve.source.getPsi

fun DeclarationDescriptor.findPsi(): PsiElement? {
    val psi = (this as? DeclarationDescriptorWithSource)?.source?.getPsi()
    return if (psi == null && this is CallableMemberDescriptor && kind == CallableMemberDescriptor.Kind.FAKE_OVERRIDE) {
        overriddenDescriptors.mapNotNull { it.findPsi() }.firstOrNull()
    }
    else {
        psi
    }
}