SOM is a minimal Smalltalk dialect used to teach VM construction at the Hasso Plattner Institute. It was originally built at the University of Århus (Denmark) where it was also used for teaching.

Currently, implementations exist for Java (SOM), C (CSOM), C++ (SOM++), and Squeak/Pharo Smalltalk (AweSOM).

A simple SOM Hello World looks like:

Hello = (
  run = (
    'Hello World!' println.
  )
)

This repository contains a plain Java implementation of SOM, including an implementation of the SOM standard library. Please see the main project page for links to the VM implementation.

Make sure to initialize the shared Smalltalk standard library, tests, and examples by importing the git submodule:

$ git submodule update --init

To build and run SOM, Java 8 or newer is required.

SOM can be built with Ant:

$ ant jar

Afterwards, the tests can be executed with:

$ ./som.sh -cp Smalltalk TestSuite/TestHarness.som

or with:

$ ant test

A simple Hello World program is executed with:

$ ./som.sh -cp Smalltalk Examples/Hello.som

Information on previous authors are included in the AUTHORS file. This code is distributed under the MIT License. Please see the LICENSE file for details.

This repo has CI setups for GitLab CI and GitHub Actions.