RE: [Jscheme-user] new killer apps for jscheme?

[Harman, P. <Pet...@ri...>]

Hi

Thought you might be interested that I am already using ANTLR with =
JScheme for a project. My (initial) reason for using JScheme is to =
create a computer-algebra library for use in Java [for rearranging / =
differentiating equations], computer algebra is best done in Lisp / =
Scheme and I have other code I want to interface with which is in Java, =
so JScheme was an obvious choice. Using ANTLR I can define the syntax =
for equations, and the parser will output the Abstract Syntax Tree in =
Lisp form, so "y =3D m*x + c" becomes "(=3D y (+ (* m x) c))", my scheme =
code can for instance rearrange this to "(=3D x (/ (- y c) m))" and this =
can be output as "x =3D (y - c) / m".

The reason I say that was my initial reason for using JScheme is that I =
am also now using JScheme to generate code from the equations (to solve =
them numerically), for which the quasi-string notation is brilliant.

Peter


-----Original Message-----
From: jsc...@li...
[mailto:jsc...@li...]On Behalf Of Ken
Anderson
Sent: 02 July 2004 22:19
To: Jscheme Users
Subject: [Jscheme-user] new killer apps for jscheme?


Geoffrey sent me an article on ANTLR, a Java/C++ parser generator.
I normally avoid such tools because their manual doesn't fit in my head =
long enough between uses.  Many common parsing problems are little more =
the lexing, such as tab delimited, fixed with fields, and i have good =
lexing technology in my head.  The problem is i don't have a good =
parsing approach yet, and i've been waiting a long time.  I'd like to =
use parser combinators but i've never worked on it enough to get a real =
example working.  I have used Mitch Wand's LL1 generator to parse CORBA =
IDL.  But ANTLR got me thinking...

1. What if we could show some examples of using ANTLR and JScheme to get =
quick little mini languages, or Scheme like languages with alternative =
syntax, as Tim has been talking about.

2.  We could use ANTLR's lexer to generate a llexer and use JScheme to =
provide the little be more that you need than lexing to your data =
organized.

3.  Use Jscheme lexer in the above item.

We aught to be able to take a specification like:
Here's a tab separated file.
The first line describes the fields.
The fields can be int, double, or String, you figure out which.
Write me a Java bean that describes each row.
Write me a reader that will read such a file and return a Vector of =
objects.

k



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