Scala to Kotlin Converter

Convert Scala source code to Kotlin source code. Optimized for unit test.

Installation

If you can use the usual git based package manager (dein, (vim-plug)[https://github.com/junegunn/vim-plug] etc) to install the converter. But you can also just load the converter into your current session:

:source …/autoload/scala2kotlin.vim<CR>"
:source …/plugin/scala2kotlin.vim<CR>"

This is especially useful if converting Scala to Kotlin is a one off effort and you don't want to use the converter all the time.

Usage

Note that Scala has a very extensive syntax with many quirks. It's not possible to create an one size fits all conversion. As such the conversion is done in steps.

ScalaConvert

function scala2kotlin#Convert()

The ScalaConvert performs the main conversion part. It converts syntax, data type and some common methods.

ScalaConvertScript

function scala2kotlin#ConvertScript()

The ScalaConvertScript performs the main conversion part for ScalaScript. It converts syntax, data type and some common methods.

ScalaConvertFunctionTest

function scala2kotlin#Convert_Function_Test()

The ScalaConvertFunctionTest converts unit test using the org.scalatest.funsuite.AnyFunSuite unit test framework. Each function test is converted into method using the back tick notation for the function name. Call `ScalaConvert' first.

ScalaConvertBDDTest

function scala2kotlin#Convert_BDD_Test()

The ScalaConvertBDDTest converts unit test using the org.scalatest.featurespec.AnyFeatureSpec and org.scalatest.GivenWhenThen unit test framework. Each feature is converted into a nested class and each scenario is converted into a method. Again using the back tick notation. Call `ScalaConvert' first.

ScalaReplaceIllegalCharacters

function scala2kotlin#Replace_Illegal_Method_Character()

Even with … notation there are few characters which are either forbidden or problematic on windows. The ScalaReplaceIllegalCharacters command replaces them with Unicode look alike which are not problematic.

ScalaConvertListLitereal

function scala2kotlin#List_Litereal()

Scala lists use :: and ::: as concatenate command and Nil to represent literals of lists. The command replaces the literal with a call to the listOf method. Select the literal to convert before calling the command.

ScalaConvertMultiImport

function scala2kotlin#Multi_Import()

Scala allows multiple imports with one import statement using {…} notation. This command will replace them with separate imports. Select the import to convert before calling the command.

Other converter.

How I ported 10K lines of Scala to Kotlin in one week?!

Kotlin Script I used as the base for my converter. While I use KotlinScript was well VimScript is so much more powerful when it comes to transforming text.

Scala to Kotlin Converter

Not compatible with «IntelliJ IDEA 2023.2.5» or «Android Studio 2022.3.1» and as such not very useful. You would need to install a very old IDEA to use it.

CodeConvert

Commercial online converter. Won't convert Scala based DSL which includes most unit and instrumentations tests. For larger projects you will have to pay eventually.