[Oberon] Where's Coco's 'hello world' ?

[Aubrey.McIntosh at Alumni.UTexas.Net]

Hi Chris.

I actually use Coco in lots of projects.  Recently, I modified the
grammar given in the N. Wirth papers and have a Coco .atg file for
PICL that will compile with no Coco errors.



On Thu, Jul 31, 2008 at 9:55 AM, Chris Glur <easlab at absamail.co.za> wrote:
> My newest version of N-O is Linux v2.4.3 -- no too old --
> and shows:
> /home/oberon/docu/Coco.Report.ps   07.02.2000 18:47:29  199238
> where the *.ps file shows '%!PS-Adobe-2.0'.
>
> I've never been able to view this !PS-Adobe-2.0' thing, and I guess
> others have also wasted a lot of effort in trying ?!
>
> After great efforts I got a viewable version from Linz > ftp.
> ---------
> I imagine a possible 'hello world' minimal test, could be
>
> <Integer>            <-- store/push integer
>
>     { ( "+"            <-- Operator :="+"
>       | "-" )           <-- Operator :="-"
> <Integer>          <-- Get Int2; Print(integer, Operator, Int2)
>     }.
> where the RHS semantic/actions are commands exported from
> specially built modules, which in the example/s are CR*.* .
>
> Apparently the components needed are:
> * syntax in EBNF
> * semantics/action matching corresponding tokens/terminals,
> in format: <SyntaxToken>  (. <Call to actionCommand/s> .)
> * Module/s to 'do' required actions.
>
> >From the big 1993 CR.ATG example file, I can't see how to
> structure a minimalist test.
>
> Can anyone help/advise ?
> Can we put a gentle HOW2 on Edgar's wiki for others to test/use ?
>
>  ---------- RE: PIC (was Re. Staapl
>>>OTOH I'm confused that he writes: ----------
>>> Conditional statements have the form shown at the left
>>> and explained in terms of conventional notation to
>>> the right.
>>>
>>> [cond -> StatSeq]               IF cond THEN Statseq END
>
> RE: PIC (was Re. Staapl, Joerg wrote:
>> I just browsed through Wirth's papers:
>> 1) http://www.inf.ethz.ch/personal/wirth/Articles/Miscellaneous/PICL.pdf
>> 2)/Miscellaneous/PICLcompiler.pdf
>>
>> The short syntax "[ Cond -> StatSeq ]" mentioned in 2) was
>> eventually replaced by the long syntax "IF Cond THEN StatSeq END".
>>
>> But even in 1) you find small "left overs" of this syntax:
>> * In 1) chap 1 you'll find "symbol = + | - ... | ->". The syntactic
>>   token "->" is foreseen.
>> * In chapter 5, the "->" is used in "GuardedStat = Condition -> StatSeq"
>>   But GuardedStat is not used.
>>
>> The two papers are not consistent and just not complete (yet!).
>> They seem to be in "draft" state.
>
> Yes ! They're dated 2008.
> I hope his PICL is available.
> The old chips are still available.
> It's strange that/if Prof Wirth retired long ago, he's still designing
> teaching projects for ETHZ.
> I wonder if/how I could join the project ?
>
> Thanks,
>
> == Chris Glur.
>
>
> --
> Oberon at lists.inf.ethz.ch mailing list for ETH Oberon and related systems
> https://lists.inf.ethz.ch/mailman/listinfo/oberon
>



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Aubrey McIntosh, Ph.D.
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