Kawa (Scheme implementation)

Kawa

Developer(s)	Per Bothner
Stable release	2.2.1 / November 26, 2016; 52 days ago (2016-11-26) (w/R7RS compatibility)
Written in	Scheme / Java
Operating system	Cross-platform
Platform	Java Virtual Machine
Type	Scheme programming language interpreter/compiler
License	MIT License
Website	https://www.gnu.org/software/kawa/

Kawa is a language framework written in Java that implements the programming language Scheme, and can be used to implement other languages. It is a part of the GNU Project.

The name "Kawa" comes from the Polish word for coffee – a play on words, since Java is another familiar name for coffee.

Besides using the Scheme programming language, Java object fields and methods can be accessed using code like this:

This will invoke a Java method, and does the same thing as object.method(argument, ...) in Java.

An object's fields can be accessed with:

or

Static (class) methods can be invoked with the function "invoke-static".

Kawa can be extended with Java code (by creating scheme functions in Java), as well as combined with other JVM implementations.

To run Kawa on GNU/Linux:

To compile a Scheme file to a class file, the -C parameter is used:

This will produce "file.class", which can be run by typing "java file". It is also possible to create an applet or servlet (to compile a servlet, "servlet-xxx.jar" must be in the CLASSPATH variable).