[plt-scheme] Reporting syntax-error to a DrScheme tool

Jens Axel Søgaard wrote:

> In the parser I use
> 
>   ; css-parser : (-> token) -> sexp
>   (define css-parser
>     (parser
>      (src-pos)
>      ; TODO: wire the error function to the language level
>      (error    (lambda (a name val start end)
>                  (raise-read-error "read-error"
>                                    (file-path)
>                                    (position-line start)
>                                    (position-col start)
>                                    (position-offset start)
>                                    (- (position-offset end)
>                                       (position-offset start)))))
>       ...
> 
> to raise an read-error.
> 
> In tool.ss I have the following on-execute method:
> 
>           (define/public (on-execute settings run-in-user-thread)
>             ; (read-case-sensitive #f)
>             (run-in-user-thread
>              (lambda ()
>                (error-display-handler
>                 (drscheme:debug:make-debug-error-display-handler
>                   (error-display-handler)))
>                (void))))
> 
> When I click "Execute" on a file with syntax-error all I get is
> 
>   read-error
> 
> in the interaction window.
> 
> What piece of the puzzle is missing?

Adding

     (error-print-source-location #t)

to on-execute gives

     #f:10:0: read-error

so it seems I need to set (file-path ...) from the tool to tell
the lexer which file path to use in the error message.

But what should I set it to?

-- 
Jens Axel Søgaard