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KSP implementation on Kotlin Analysis API

There is a newer version: 2.1.0-Beta1-1.0.25

/*
 * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
 * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
 */

package org.jetbrains.kotlin.asJava

import com.intellij.psi.PsiElement
import org.jetbrains.kotlin.asJava.classes.runReadAction
import org.jetbrains.kotlin.asJava.elements.KtLightElementBase
import org.jetbrains.kotlin.psi.KtExpression
import org.jetbrains.kotlin.resolve.DelegatingBindingTrace
import org.jetbrains.kotlin.resolve.constants.ArrayValue
import org.jetbrains.kotlin.resolve.constants.ConstantValue
import org.jetbrains.kotlin.types.TypeUtils

fun computeExpression(expression: PsiElement): Any? {
    fun evalConstantValue(constantValue: ConstantValue<*>): Any? =
        if (constantValue is ArrayValue) {
            val items = constantValue.value.map { evalConstantValue(it) }
            items.singleOrNull() ?: items
        } else {
            constantValue.value
        }

    val expressionToCompute = when (expression) {
        is KtLightElementBase -> expression.kotlinOrigin as? KtExpression ?: return null
        else -> return null
    }

    val generationSupport = LightClassGenerationSupport.getInstance(expressionToCompute.project)
    val evaluator = generationSupport.createConstantEvaluator(expressionToCompute)

    val constant = runReadAction {
        val evaluatorTrace = DelegatingBindingTrace(generationSupport.analyze(expressionToCompute), "Evaluating annotation argument")
        evaluator.evaluateExpression(expressionToCompute, evaluatorTrace)
    } ?: return null

    if (constant.isError) return null
    return evalConstantValue(constant.toConstantValue(TypeUtils.NO_EXPECTED_TYPE))
}