plugins/kotlin/uast/uast-kotlin-base/src/org/jetbrains/uast/kotlin/internal/KotlinUElementWithComments.kt


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// Copyright 2000-2021 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.

package org.jetbrains.uast.kotlin.internal

import com.intellij.psi.PsiComment
import com.intellij.psi.PsiElement
import com.intellij.psi.PsiWhiteSpace
import org.jetbrains.kotlin.psi.KtValueArgument
import org.jetbrains.kotlin.psi.psiUtil.allChildren
import org.jetbrains.uast.UComment
import org.jetbrains.uast.UElement
import org.jetbrains.uast.UExpression
import org.jetbrains.uast.UParameter

interface KotlinUElementWithComments : UElement {

    override val comments: List<UComment>
        get() {
            val psi = sourcePsi ?: return emptyList()
            val childrenComments = psi.allChildren.filterIsInstance<PsiComment>().map { UComment(it, this) }.toList()
            if (this !is UExpression &&
                this !is UParameter     // fun (/* prior */ a: Int) <-- /* prior */ is on the level of VALUE_PARAM_LIST
            )
                return childrenComments
            val childrenAndSiblingComments = childrenComments +
                    psi.nearestCommentSibling(forward = true)?.let { listOf(UComment(it, this)) }.orEmpty() +
                    psi.nearestCommentSibling(forward = false)?.let { listOf(UComment(it, this)) }.orEmpty()
            val parent = psi.parent as? KtValueArgument ?: return childrenAndSiblingComments

            return childrenAndSiblingComments +
                    parent.nearestCommentSibling(forward = true)?.let { listOf(UComment(it, this)) }.orEmpty() +
                    parent.nearestCommentSibling(forward = false)?.let { listOf(UComment(it, this)) }.orEmpty()
        }

    private fun PsiElement.nearestCommentSibling(forward: Boolean): PsiComment? {
        var sibling = if (forward) nextSibling else prevSibling
        while (sibling is PsiWhiteSpace && !sibling.text.contains('\n')) {
            sibling = if (forward) sibling.nextSibling else sibling.prevSibling
        }
        return sibling as? PsiComment
    }

}