2022-10-20 10:38:39 <nature      > Good afternoon, I am trying to figure out a bit how recognizers works in Gforth, but I am not even sure I am on the right path...  What I am trying to do is to parse HTTP headers with evaluate, the issue tho is if there are new headers for which I have no function defined my program crashe with the "Undefined word" error, when I would simply want the interpreter to skip the line if it can't find the word.
2022-10-20 10:39:03 <nature      > Any suggestion or hints at how to proceed there appreciated
2022-10-20 12:26:13 <KipIngram   > I think you will have to use WORD and FIND yourself rather than leaving it to the built in interpreter/compiler.
2022-10-20 12:29:56 <KipIngram   > It should be fairly straightforward, though.
2022-10-20 12:30:14 <KipIngram   > The built in system doesn't know how to do anything other than error on an undefined word.
2022-10-20 12:30:35 <KipIngram   > I'm not aware of any system that offers you a way to hook those error paths.
2022-10-20 12:37:29 <nature      > I actually managed something with recognizers :)
2022-10-20 12:38:09 <nature      > created the following word: `: rec-all 2drop ['] noop ['] recognized-nt ;`
2022-10-20 12:39:04 <nature      > then I add it to the recognizer and basically any undefined words is equivalent to calling the noop word
2022-10-20 18:04:30 <KipIngram   > If I wanted to just quietly ignore undefined words in my (rather non-standard) system, I'd do something along these lines:
2022-10-20 18:04:49 <KipIngram   > : parse  bl word find ?dup 0=me execute me ;
2022-10-20 18:05:10 <KipIngram   > That presumes the string is null-terminated; the null word will break the loop.
2022-10-20 18:05:48 <KipIngram   > Or maybe I'd define a ?exec word that handled the decision.
2022-10-20 18:12:50 <KipIngram   > Though you probably want numbers to get handled too, don't you?