Re: Error handling with Coco/r

On Dec 7, 2:38 am, John Williams <johnwilliam...@live.com> wrote:
> I'm using the tool Coco/r to build a grammar for a programming language. My
> token section is something like this:
>
> id = letter { letter | digit }.
> integer = digit { digit }
> | digit { hexDigit } "H".
>
> The problem is that a wrong hexadecimal number in an assignment such as "a
:=
> 32GH;" is identified as an error by the syntax analyzer. I would like to
> produce a more meaningful message such as "invalid hexadecimal" so I think
I
> need to detect errors at lexer level. Is there any option in Coco/r or
should
> I have to modify the scanner by hand?


I've played a bit lately and I guess you can probably modify the
Scanner.frame. I did it with the purpose of switching off some
spurious warnings.

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