org.jetbrains.kotlin.ir.backend.js.lower.StaticMembersLowering.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.ir.backend.js.lower

import org.jetbrains.kotlin.backend.common.CommonBackendContext
import org.jetbrains.kotlin.backend.common.DeclarationTransformer
import org.jetbrains.kotlin.ir.declarations.*
import org.jetbrains.kotlin.ir.util.file
import org.jetbrains.kotlin.ir.util.isEffectivelyExternal

// Move static member declarations from classes to top level
class StaticMembersLowering(val context: CommonBackendContext) : DeclarationTransformer {
    override fun transformFlat(declaration: IrDeclaration): List? {
        (declaration.parent as? IrClass)?.let { irClass ->
            val isStatic = when (declaration) {
                is IrClass -> !declaration.isEffectivelyExternal()
                is IrSimpleFunction -> declaration.isStaticMethodOfClass && !declaration.isEffectivelyExternal()
                is IrField -> declaration.isStatic
                else -> false
            }

            if (isStatic) {
                declaration.parent = irClass.file
                irClass.file.declarations += declaration
                return listOf()
            }
        }

        return null
    }
}