org.jetbrains.kotlin.js.inline.clean.substituteKTypes.kt Maven / Gradle / Ivy

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/*
 * Copyright 2010-2019 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.js.inline.clean

import org.jetbrains.kotlin.js.backend.ast.*
import org.jetbrains.kotlin.js.backend.ast.metadata.SpecialFunction
import org.jetbrains.kotlin.js.backend.ast.metadata.kType
import org.jetbrains.kotlin.js.backend.ast.metadata.specialFunction
import org.jetbrains.kotlin.js.backend.ast.metadata.staticRef

// Replaces getReifiedTypeParameterKType() with its KType
fun substituteKTypes(root: JsNode) {
    val visitor = object : JsVisitorWithContextImpl() {
        override fun endVisit(invocation: JsInvocation, ctx: JsContext) {
            val qualifier = invocation.qualifier as? JsNameRef ?: return
            if (qualifier.name?.specialFunction != SpecialFunction.GET_REIFIED_TYPE_PARAMETER_KTYPE) return
            val firstArg = invocation.arguments.first()
            getTransitiveKType(firstArg)?.let {
                ctx.replaceMe(it)
            }
        }
    }
    visitor.accept(root)
}

// Get KType from expression or from staticRef of referenced name
fun getTransitiveKType(e: JsExpression): JsExpression? {
    return when {
        e.kType != null ->
            e.kType

        e is JsNameRef -> {
            val staticRef = e.name?.staticRef as? JsExpression ?: return null
            getTransitiveKType(staticRef)
        }

        else -> null
    }
}