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<font size="-1"><font face="Helvetica, Arial, sans-serif">Dear
Chide,<br>
<br>
In order to test programs written in Java with Gast I use a
slightly extended TCP interface from Clean. There is a TCP
interface in distribution (or rather two of them). The messages
are arbitrary data types that are encode en decode on the Clean
side by some generic functions. On the Java side the user has to
do some work on encoding decoding manually. This works fine for
the rather simple messages used by Gast..<br>
<br>
</font></font><font size="-1"><font face="Helvetica, Arial,
sans-serif">Maybe the JSON stuff works even better since there
is a better interface on the Java side. On the Clean side there
is also a generic interface, you can just derive the needed
conversions. I have no experience with this JSON library (apart
from using it in iTasks).<br>
</font></font><br>
<font size="-1"><font face="Helvetica, Arial, sans-serif">Dynamics
would not be my choice since they contain unevaluated Clean
expressions and (references to) Clean code. You would need too
much machinery to handle this in any other language.<br>
<br>
Best, Pieter<br>
</font></font><br>
On 21/11/2011 3:02 PM, Bas Lijnse wrote:
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The JSON libraries that Erik mentions are available from:<br>
<a moz-do-not-send="true" class="moz-txt-link-freetext"
href="https://svn.cs.ru.nl/repos/clean-platform/trunk/src/libraries/OS-Independent/Text/">https://svn.cs.ru.nl/repos/clean-platform/trunk/src/libraries/OS-Independent/Text/</a><br>
<br>
I always use this when I want to do simple data exchange between
Clean and another language (I may be biased as author/maintainer
of the library though :) )<br>
<br>
Best,<br>
Bas<br>
<br>
On 21-11-11 14:52, <a moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:zuurb078@planet.nl">zuurb078@planet.nl</a> wrote:
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cite="mid:CADF5EBE816E3442BA4BF7F7BB8978530787E02C@CPEXBE-EML19.kpnsp.local"
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<title>RE: [clean-list] Dynamic typing for communication with
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<p><font size="2">And dump all the hard work on Java? Dynamics
are a proprietary Clean format and likely more
complex/liberal than you need. Maybe JSON is easier to use:
probably available in your JAVA implementation already and
under the hood JSON converters are already available in
Clean iTasks.<br>
<br>
<br>
-----Oorspronkelijk bericht-----<br>
Van: <a moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:clean-list-bounces@science.ru.nl">clean-list-bounces@science.ru.nl</a>
namens Groenouwe, C.<br>
Verzonden: ma 21-11-2011 13:39<br>
Aan: <a moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:pieter@cs.ru.nl">pieter@cs.ru.nl</a><br>
CC: <a moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:clean-list@science.ru.nl">clean-list@science.ru.nl</a><br>
Onderwerp: [clean-list] Dynamic typing for communication
with non-cleanprograms<br>
<br>
Dear Pieter (and others),<br>
<br>
Then another question:<br>
<br>
If you want to send information from one programming
language (e.g. Java) to Clean, a typical way to go would be
the following. First define an intermediate representation
(for example in XML, or your own format). Then write a
generator on the sender's side (in this case in Java), which
converts a Java value or object into a file in the
intermediate representation. Finally, write a parser on the
receiver's side (Clean) which parses file holding the
intermediate representation into a Clean value (with a Clean
type). This is a labourious process during which you have
the feeling you are are doing a lot of unnecessary work. As
if you are repackaging the same sandwich three times in a
row, first in a Java structure, then in the intermediate
structure, and then again in a Clean structure... Waste of
time (and the environment...) ;-)<br>
<br>
However, I had an idea: is it possible to use Clean's
dynamic types for this purpose? Instead of generating some
arbitrary intermediate type on the sender's side,
immediately generate a value that can be read by Clean's
dynamic type system. This would cut your work in half: you
don't have to write a parser on Clean's side any more.<br>
<br>
I don't have any experience using Clean's dynamic typing
yet, therefore I decided to first ask whether it is a
fruitful approach before exploring it. Thus, is this
possible and is it a good idea? Of course, I'm also open to
other suggestions.<br>
<br>
Thanks in advance,<br>
<br>
Chide<br>
<br>
<br>
<br>
<br>
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