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<td class="content" valign="top" width="50%" align="right"><span class="section">4</span></td>
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<td class="content" valign="top" width="480" align="left"><!-- Content --><!-- Intro --> <br><span class="headline">io
& amalthea</span><span class="date"> 021126</span><br>A couple of
years back I was reading through Raphael Finkel's book <i>Advanced
Programming Language Design</i>. I thought the book an excellent and fun
introduction to various programming language concepts and constructs, but
the part that intrigued me the most was a section on <i>continuations</i>,
a fundamental and powerful construct which can be used to express many
more common language constructs. I was somewhat familiar with the concept
prior to reading about them in APLD but the author used a programming
language called Io to introduce the concept and this language struck me as
both confounding and beautiful. The language is absolutely tiny, both in
syntax and in the ammount of concepts supported. It really has nothing but
continuations, both for flow control and data. Continuations are used for
expressing conditional statements, functions, and even structured data
types. List, tuples, trees, and so on can all be expressed using first
class continuations.
<p>Since the language so tickled my language nerve I wanted to try it out,
play around a bit. Scouring the net with Google turned up very little, no
implementations and no other references to the language than the one found
in the aforementioned book. I asked around, still nothing. And so I
concluded that there was no implementation available for this tiny
language. I then let the subject be until I had to chose a project for a
class, topics in computer languages. I decided my project should be an Io
interpreter and I decided it should go by the name Amalthea (Amalthea is
one of the smaller moons of Jupiter while Io is a large one).
</p><p><span class="headline">amalthea</span><span class="date">
021126</span><br>Amalthea was made using <a class="content" href="http://replay.waybackmachine.org/20081118165414/http://www.ocaml.org/">OCaml</a>,
which I learned to make Amalthea. I was a mostly pleasurable experience
even though OCaml's syntax is nowhere near as nice as <a class="content" href="http://replay.waybackmachine.org/20081118165414/http://www.haskell.org/">Haskell</a>'s.
I also didn't really exploit (or need) any of OCaml's OO or module
features in making Amalthea, so a lot remains to be learned.
</p><p>Amalthea is, as always with this kind of projects, heavily under
development, whenever I get the urge to. I mean Amalthea to come with a
small standard library, some detailed examples, and good documentation.
What's here for you to download is a snapshot of the progress in each
area. Most notable is the lack of any documentation on how to program Io.
For now I'll have to refer anyone who downloads Amalthea with the
intention of trying it out to Advanced Programming Language Design,
available <a class="content" href="http://replay.waybackmachine.org/20081118165414/http://www.nondot.org/sabre/Mirrored/AdvProgLangDesign/">on
the web</a>.
</p><p><span class="headline">download</span><span class="date">
030128</span><br>A new version, 0.874. It's added a bunch of stuff,
including mutable variables and selective imports. Version 0.875 is merely
a new distribution with a filename change to compile under *nix. The error
reporting is a bit flakey in this release but improvements are comming
along as I have the time and inclination. A Windows(tm) binary is included
along with the sources, users of other OSs will have to compile it
themselves using a recent version of OCaml. If anyone wants to make
distributions for Linux, please do so and I'll put them up here.
</p><p><a class="content" href="http://replay.waybackmachine.org/20081118165414/http://www.guldheden.com/~sandin/files/amalthea0875.tar.gz">Download
Amalthea v0.875</a>
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