Android SISC Scheme Eval is an experimental Android App that uses The SISC Scheme Java interpreter to evaluate scheme code. The app is mainly a proof of concept. This repository contains the Eclipse project and app source code to facilitate experimentation. The sources include:
- A patched version of SISC Scheme - release 1.17.0 alpha. The version in this repository does not contain the dynamic class generation library - which won't work on Android's dex bytecode. It also includes a small patch to get the s2j module (scheme to java) implementation to work.
- A minimal version of the thankfully GPL-licensed openjdk's java beans source.
SISC depends on it, but Android provides very limited support for java beans.
The version in this repository is nearly completely decoupled from
the
java.awt.*classes. All classes are namespaced underneomantic.*.
The current version of this application does not support running *.scm files
that are external to the application (say, stored on the sdcard). Instead, the
scheme source code must be compiled into the application itself. By default, they must
be placed in the assets/scm/ directory. The application will automatically
load them at startup.
To use this source, this line must be edited in the app's EvalActivity class.
Value v = interpreter.eval("(length)");
The results will be displayed, without fanfare, in a rudimentary android TextWidget
area. An example is in the repository assets/scm/java-test.scm. This code creates
an org.json.JSONArray object, and interpreter.eval("(length)") queries its length.
Currently, the app will perform all the tasks that I describe in this tutorial. Most importantly, it can instantiate and manipulate Java objects 'live'.
However, as the tutorial mentions, it fails to perform simple recursions.
This project will mainly be used a testing ground. I may add, for instance, the ability to eval scripts from the sdcard, from, say, list of items. However, it will not be involved into a full REPL. I will create a new project for that.
My source is released under the GNU General Public License Version 2 (GPL). The full text of this license can be found in a file called COPYING released with the source code. The java bean source code is GPL license by Sun, and hence so are my patches to it. The SISC source code is dual license Mozilla/GPL, so my changes to that code fall under those.