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Chris,
the Component Pascal reference defines the syntax for the FOR statement as follows:
FOR ident ":=" Expr TO Expr [BY ConstExpr] DO StatementSeq END.
The definition for ident is:
ident = (letter | "_") {letter | "_" | digit}.
letter = "A" .. "Z" | "a" .. "z" | "À".."Ö" | "Ø".."ö" | "ø".."ÿ".
digit = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9".
That's why designators of the form "r.i" or "a[0]" cannot be used as control variables.
Since the FOR statement is defined in terms of the WHILE statement, a language change to allow also designators would be fairly straight forward.
Cheers
Marc
Oberon microsystems AG
> -----Original Message-----
> From: blackbox{([at]})nowhere.xy> Behalf Of CFB Software
> Sent: Donnerstag, 25. August 2005 02:33
> To: Blackbox
> Subject: [BlackBox] - FOR loop control variable restrictions?
>
>
> The following statements which compile under ETH Oberon-2 for
> Windows fail to compile in BlackBox:
>
> FOR r.i := 1 TO 10 DO END;
> FOR a[0] := 1 TO 10 DO END;
>
> where r and a are declared as:
>
> r: RECORD i: INTEGER END;
> a: ARRAY 10 OF INTEGER;
>
> I cannot find any documentation relating to these
> restrictions in BlackBox. Are they intentional?
>
> Chris Burrows
> CFB Software
> http://www.cfbsoftware.com/gpcp
>
> --- BlackBox
> --- send subject HELP or UNSUBSCRIBE to blackbox{([at]})nowhere.xy>
>
--- BlackBox
--- send subject HELP or UNSUBSCRIBE to blackbox{([at]})nowhere.xy
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Received on Thu Aug 25 2005 - 13:41:53 UTC