EuLisp is a statically and dynamically scoped Lisp dialect developed by a loose formation of industrial and academic Lisp users and developers from around Europe. The standardizers intended to create a new Lisp "less encumbered by the past" (compared to Common Lisp), and not so minimalistic as Scheme. Another objective was to integrate the Object-oriented programming paradigm well.
Language definition process first began in a meeting in 1985 in Paris and took a long time. The complete specification and a first implementation (interpreted-only) was available in 1990.
Its primary characteristics are that it is a Lisp-1 (no separate function and variable namespaces), has a CLOS-style (Common Lisp Object System) generic-function type object-oriented system named TELOS (The EuLisp Object System) integrated from the ground up, has a built-in module system, and is defined in layers to promote the use of the Lisp on small, embedded hardware and educational machines. It supports continuations, though not as powerfully as Scheme. It has a simple lightweight process mechanism (threads).
- A definition in levels, currently Level-0 and Level-1
- Modules based on (non-first-class) lexical environments.
- Lexically scoped, with dynamic binding available in Level-1.
- A single name space for function and variable names (like Scheme).
- Lightweight processes.
- A fully integrated object system with single inheritance at Level-0 and multiple inheritance and meta-object protocol an Level-1.
- An object-oriented condition system.
An early implementation of EuLisp was FEEL (Free and Eventually Eulisp). The successor to FEEL was Youtoo (interpreted and compiled versions), by University of Bath in the United Kingdom. An interpreter for the basic level of EuLisp, "level-0", was written by Russell Bradford in XScheme, an implementation of Scheme by David Michael Betz, originally called EuScheme http://www.bath.ac.uk/~masrjb/ but the most recent version is renamed EuXLisp http://github.com/Henry/EuLisp/ to avoid confusion. Also Eu2C http://github.com/Henry/EuLisp/, a EuLisp optimizing compiler, was created by Fraunhofer ISST under the APPLY project in Germany http://publica.fraunhofer.de/dokumente/PX-46999.html.
A dialect of EuLisp was developed, called Plural EuLisp; it was EuLisp with parallel programming extensions.
Example use of classes in the algorithm to solve the "Towers of Hanoi" problem.
"An Overview of EuLisp", Julian Padget, Greg Nuyens, and Harry Bretthauer, editors. Lisp and Symbolic Computation, Volume 6, Number 1-2, 1993, pages 9 98.
"Balancing the EuLisp Metaobject Protocol", Harry Bretthauer, J rgen Kopp, Harley Davis, and Keith Playford. Lisp and Symbolic Computation, Volume 6, Issue 1-2, August 1993, pages 119-138.
"EuLisp in Education", R. Bradford and D.C. DeRoure. Lisp and Symbolic Computation, Volume 6, Number 1-2, pages 99 118.
"Applications of Telos", Peter Broadbery, Christopher Burdorf. Lisp and Symbolic Computation, Volume 6, Issue 1-2, August 1993, pages 139-158.
"A Practical Approach to Type Inference for EuLisp", Andreas Kind and Horst Friedrich. Lisp and Symbolic Computation, Volume 6, Issue 1-2, August 1993, pages 159-176.
"EuLisp Threads: A Concurrency Toolbox", Neil Berrington, Peter Broadbery, David DeRoure, and Julian Padget. Lisp and Symbolic Computation, Volume 6, Issue 1-2, August 1993, pages 177-200.
"Plural EuLisp: A Primitive Symbolic Data Parallel Model", Simon Merrall, Julian Padget. Lisp and Symbolic Computation, Volume 6, Issue 1-2, August 1993, pages 201-219.
"A Conservative Garbage Collector for an EuLisp to ASM/C Compiler", E. Ulrich Kriegel. OOPSLA'93 Workshop on Garbage Collection and Memory Management, Washington, DC, September 27, 1993.
"An Implementation of Telos in Common Lisp", Object Oriented Systems, vol. 3, pp. 31 49, 1996. ISSN 0969-9767.