[plt-scheme] DrScheme online syntax highlighting

On Mon, 2003-11-03 at 15:05, John Clements wrote:
> On Monday, November 3, 2003, at 02:59  PM, Daniel Silva wrote:
> > On Mon, 2003-11-03 at 14:42, John Clements wrote:
> >> On Monday, November 3, 2003, at 02:27  PM, Daniel Silva wrote:
> >>> Does anybody who tried highlight.ss get errors like these when 
> >>> loading
> >>> scheme files?
> >>>
> >>> open-input-text-editor: end index outside the range [1997,3000]: 1024
> >>> open-input-text-editor: end index outside the range [2596,4000]: 2011
> >>> #<struct:object:/home/daniel/plt/collects/stepper/stepper-
> >>> tool.ss:525:8>:1:0: read: expected a ')'
> >>
> >> No idea, but the "#<struct....stepper-tool.ss:525:8>" is actually
> >> DrScheme's definitions-text%.  This is because the stepper tool 
> >> applies
> >> a mixin to this text% to override several text% methods.
> >>
> >
> > It looks like stepper-definitions-text-mixin overrides on-insert and
> > on-delete.  I override after-insert and after-delete to change the
> > nearest sexp's style.  I didn't think that change-style would trigger
> > on-insert or on-delete.
> >
> > Do drscheme:eval:traverse-program/multiple, syntax-case, expand, or
> > drscheme:language:make-text/pos invoke on-insert or on-delete?  I'm
> > using those to read sexps, and the combination of get-backward-sexp and
> > get-forward-sexp to find the last sexp typed.
> 
> No, no, let me clarify.  The error that you're getting in all 
> likelihood has
> nothing whatsoever to do with the stepper.  Since the stepper is the 
> last
> one to mix something into drscheme's definitions-text, the object that 
> is
> the result of this composition (the text%) is given a source position in
> the stepper.  Any error message in DrScheme that involves DrScheme's
> definitions-text% will refer to it as a struct that comes from the 
> stepper.
> 
> Put another way:  rm -rf the stepper collection.  I claim that (with
> high likelihood) the bug will still be present, and the error message 
> will
> look the same, except that the source position given will come from some
> other tool.
> 

Oh, you're right -- it came from syntax-color before and when I removed
the dir, the error came from the steppper.

Do mixins make it impossible to debug classes then?  I can't remove the
stepper because DrScheme requires it.  The error message points to the
beginning of the mixin class, not a method, and a with-handlers guard
around my code isn't catching the error.  Can I catch errors with some
other way? Is there a with-all-inclusive,-even-internal-errors-handlers
form?

Daniel