Updates

are a set of add-on classes that were used to compile the IDE of the (now pretty much obsolete) T3X compiler. The T3X page now contains a link to the final version of TIDE.

[2007-05-22] Scheme 9 from Empty Space

is about 40% faster now due to environment hashing.

[2007-05-20] Sketchy LISP, 2nd Ed.

The second revised and extended edition of Sketchy LISP is now out. More Scheme, crisper prose, lots of addititions. Buy it now!!1

[2007-05-09] Site update.

Removed some CSS hacks, replaced headings with plain text, made the layout more compatible so that it does not suck in IE.

[2007-04-19] Plain Text, Please!

is an essay outlining the advantages of plain text email messages.

[2007-04-04] Scheme 9 from Empty Space

made more progress. It also has a simple test suite now.

[2007-03-31] Scheme 9 from Empty Space

made some progress and is now marginally useful.

[2007-03-26] Scheme 9 from Empty Space

will eventually become an interpreter for a subset of R5RS Scheme. It is based on Sketchy LISP, but simpler.

[2007-03-06] PS/Tk Update

Update to latest version, added manual.

[2007-02-18] SketchyLISP Update

Added immutable vectors.

[2007-02-03] PS/Tk Update

Added Tile support.

[2007-01-31] Logic Programming in Scheme

This tiny textbook is my latest work. It is a revised version of Symbolic Programming in Symbolic LISP. It explains how to embed logic programming into Scheme.

[2007-01-31] SketchyLISP Update

Brought the AMK logic programming subsystem up to date.

[2007-01-20] PS/Tk Update

Added a (Petite) Chez Scheme port.

[2007-01-18] SketchyLISP Update

Improved syntax transformation
Added Cygwin support
Updated manual

[2007-01-09] SketchyLISP Update

Fixed some typos in the library documentation.

[2007-01-05] PS/Tk Update

Fixed a rather annoying bug.

[2006-12-31] SketchyLISP Update

Applied a few micro optimizations to the interpreter and lots of fixes to the documentation.

[2006-12-20] Added the Random Bits Pages

Added a text describing purely functional streams to the Random Bits.

[2006-12-18] Minor PS/Tk Update

Applied some minor fixes.

[2006-12-08] Minor PS/Tk Update

Scheme procedures may now pass lists to Tk.

[2006-12-03] Updated PS/Tk

Added PLT/Wind*ws, Scheme 48, and Gambit ports. Applied some bug fixes.

[2006-12-02] Added the PS/Tk Pages

PS/Tk is a portable interface between the Scheme programming language and the Tk Toolkit. Except for one single procedure it is written in pure R5RS Scheme.

[2006-11-27] SketchyLISP Update

Made allocation and GC safer and faster.
Added read-from-string and write-to-string primitives.
Cleaned up the source code.
Updated the manual.

[2006-11-16] SketchyLISP Update (major)

Added R5.91RS-style #|...|# and #;form comments;
Made some substantial changes to the manual;
Made some changes to the C API;
Fixed a few more bugs in the syntax transformer;
Improved and cleaned up many example programs;
Added pretty printer man page.

[2006-11-14] SketchyLISP Manual Update

Uploaded the first three chapters of the new edition of the reference manual.

[2006-11-07] SketchyLISP Update (major)

Added a pretty-printer.
Imported a load of functions from the upcoming R⁶RS.
Separated extension library from examples. See ext/.
Added peek-char primitive.
Added case syntax.
Added #! comments.
Added new command line option comments.
Require now searches $SKETCHYSRC.
Syntax transformers are now stable.
Made error handling more robust.
Brought the manual up to date.

[2006-10-23] SketchyLISP Update

Fixed some bugs. Added an example. Updated the documents.

[2006-10-20] Added T3X pages

This section contains the complete online edition of the T3X Reference Manual, and the last version of the compiler kit. Enjoy!

[2006-10-14] SketchyLISP Update

Applied various small fixes and changes.

[2006-10-08] Another Micro KANREN

Added a Scheme version of ArrowLISP Micro KANREN and the inevitable zebra example.

[2006-10-08] SketchyLISP Update

Applied one major fix (syntax transformers can now be redefined) and some minor/cosmetical changes.
Also added AMK example (see above).

[2006-10-07] SketchyLISP Update

Some minor changes, mostly internal.

[2006-10-05] SketchyLISP Update

Added a subset of R5RS syntax transformers (define-syntax and syntax-rules) and fixed a few minor bugs.

[2006-10-01] SketchyLISP Update

Improved (hopefully) the interpreter shell.

[2006-09-30] SketchyLISP Update

Added IF primitive and applied some cosmetical fixes.

[2006-09-24] SketchyLISP Update

Finished the API documentation, cleaned up the code.

[2006-09-15] Symbolic Programming for the Impatient

This is the title of my latest book -- an introduction to functional programming using symbols. This is both a detailed description of the ArrowLISP language and an in-depth introduction to architecture-neutral functional programming.

[2006-09-13] Updated ArrowLISP

Fixed a subtle tail recursion bug.

[2006-09-13] Updated SketchyLISP

Fixed a subtle tail recursion bug.

[2006-09-12] Updated ArrowLISP distribution

Just a maintenance release.

[2006-09-04] Major Site Update

Changed style sheet and implemented some behind-the-scenes stuff in order to make future updates less painful.

[2006-09-03] Added Updates Page

This page replaces the RSS feed.

[ unknown ] Logic Programming in Symbolic LISP

This is the title of my latest booklet. Everything you need to get started with logic programming in less than 40 pages. Including the LISP code to a complete logic programming language.

[ unknown ] ArrowLISP Update

Added KANREN-like logic programming extensions. MEXPRC, the M-expression compiler, is back and so are most of the minor example programs. Even if you never do so, be sure to read the README this time (core language changes ahead!).

[ unknown ] Bookshelf added

This is a collection of current titles and back issues of books that I have written.

[ unknown ] ArrowLISP port updated

The FreeBSD port of ArrowLISP now uses the 2006 version.

[ unknown ] Added ArrowLISP Pages

ArrowLISP is an interpreter for purely symbolic, side effect-free, lexically scoped LISP. This version is a much cleaned-up rewrite of the 2005 interpreter.

[ unknown ] Added the HYPER program

HYPER implements the hyper-N operator.

[ unknown ] Added the INFIX program

INFIX converts expressions from prefix to infix notation.

[ unknown ] Added the PREFIX program

PREFIX converts expressions from infix to prefix notation using recursive descent parsing.

[ unknown ] The Sketchy LISP Tutorial is back

Enjoy.

[ unknown ] Bleeding Edge Release

This release separates the interpreter from the user shell and packages the core in a library. The interpreter is now theoretically embeddable (but not yet very useful). API documentation is non-existant at this point.

[ unknown ] Added READ-LINES program

Read a newline-terminated sequence of characters.

[ unknown ] Added BOTTLES program

Print the lyrics of "99 bottles of beer on the wall".

[ unknown ] Added QSORT program

Sort a list using Quicksort.

[ unknown ] Added PROLOG program

A simple, side effect-free PROLOG interpreter.

[ unknown ] Added PERMUTE program

PERMUTE computes the permutations of a set.

[ unknown ] Improved FACTORS program

The detection of prime factors was improved by testing only divisors up to the square root of the argument.

[ unknown ] Added FACT program

FACT implements a fast factorial algorithm.

[ unknown ] Added FACTORS program

FACTORS factorizes an integer down to its constituent primes.

[ unknown ] Added DRAW-TREE program

DRAW-TREE prints a tree structure that resembles a Scheme expression.