[Oberon] Where's Coco's 'hello world' ?
Chris Glur
easlab at absamail.co.za
Thu Jul 31 16:55:49 MEST 2008
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.
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