Re: [Gm2] cvs updated

[Iztok Kobal]

> I don't understand your comment about the CASE statement though.. the
> gm2 bnf is:
>
> CaseStatement := "CASE" Expression "OF" Case { "|" Case }
>                 [ "ELSE" StatementSequence ] "END" =:
>
> Case := CaseLabelList ":" StatementSequence =:
>
> perhaps you could post a small code example?
AFAIK ISO M2 compilers (SBM2, XDS, GPM) (I am not sure if it is by 
standard) allow:

CaseStatement := "CASE" Expression "OF" ["|"] Case { "|" Case }
                [ "ELSE" StatementSequence ] "END" =:


While PIM2 explicitly disallows it.

It is not really important - only when having code with compiler options 
where can be possible that the first line in the CASE statement varies:

CASE a OF
#if SOMETHING
 case1 : statement1;
#endif
 | case2 : statement2;
...
....

This very example could be solved by putting the "|" char at end of line 
- but you know that everyone has its own aestetics for source formatting.

Anyway, what is really important is that the work on ISO is going on.


And more about CASE

Compilation of next (illegal) CASE sentence

TYPE CT = RECORD
           CASE  b:CARDINAL OF
             1 : a : CARDINAL;
           | 2 : a : INTEGER;
           END;
         END;

produces

case.mod:0: internal error: Segmentation fault

while legal (at least by ISO) CASE sentence

TYPE CT = RECORD
           CASE  :CARDINAL OF  (* virtual case modifier *)
             1 : a : CARDINAL;
           | 2 : b : INTEGER;
           END;
         END;

produces

case.mod:...:syntax error, found `:'
case.mod:...:compilation failed


If I find more I'll tell.

Regards !

Iztok


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