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Re: [pdf-devel] I'm Back at last
From: |
gerel |
Subject: |
Re: [pdf-devel] I'm Back at last |
Date: |
Thu, 13 Dec 2007 21:44:47 -0300 |
> > 3. For pdf_error I'm considering writing wrappers for those functions
> > available on lib/error.c and to write new ones for gnupdf as
> > needed. OTOH, I'm pretty new on the project to know which error types
> > should be added. I guess we should analyse each module on each layer and
> > decide from there, don't you ?
>
> Some observations from pdf_function.c: Error reporting from a leaf module
> tends to be cryptic for a mere user. For example, a pdf function
> dictionary may miss a required key, the dictionary data may be
> inconsistent in various ways, a type 4 function definition may have a
> syntax error in its sublangage, and so on.
>
> There are errors at function call time,too. A PDF shading function may be
> called millions of times, reporting each error is probably not useful.
> I'd need some way to defer error reporting. What about a pdf dictionary
> as "error object" ? It might be passed freely, accreting context as it
> moves?
>
> Would be good to have some global data structure able to stack errors of
> several severities.
If I understood your point, the idea I have in mind is to define _general_ error
types and error reporting procedures for describing user-level problems. OTOH
for those errors that aren't of much use to users and are reported for
debugging purposes, instead of filling every source file with:
#ifdef DEBUG
....
#endif
statements I'd suggest to write some procedure/macro let's say "PDF_DEBUG" and
use it on every place needed. And then in case we're compiling source
--with-no-debug just define "PDF_DEBUG" to ' ' (void).
Note that I'm just talking about error reporting here, error checking and
recovering is subject to the caller procedure.
I hope I answered your doubts. If not, sorry :-/
-gerel
- Re: [pdf-devel] I'm Back at last, (continued)
Re: [pdf-devel] I'm Back at last, Hardy Falk, 2007/12/13