Right, it's a tricky problem because (in your example) "stage1" might not
be defined, so stage1 cannot appear in the definition of "check_marker".
Fortunately Neil Bawd's word ANEW does something similar:
http://www.wilbaden.com/neil_bawd/tool2002.txt
His original definitions are:
: POSSIBLY ( "name" -- ) BL WORD FIND ?dup AND IF EXECUTE THEN ;
: ANEW ( "name" -- )( Run: -- ) >IN @ POSSIBLY >IN ! MARKER ;
But in AmForth it is supplied already as common/lib/anew.frt:
: possibly ( "name" -- )
parse-name find-xt if execute then ;
: anew ( "name" -- ) >in @ possibly >in ! marker ;
On Wed, Jun 29, 2016 at 3:37 PM, Tristan Williams wrote:
> Apologies, that should be (and is in my code)
>
> check_marker
>
>
> On 29Jun16 23:23, Tristan Williams wrote:
> > Hello,
> >
> > I would like to set a marker or execute a marker dependant upon
> > whether that marker exists or not. What I have in mind is something
> > like this
> >
> > : check_marker [defined] stage1 if stage1 else marker stage1 then ;
> >
> > followed by
> >
> > check_maker
> >
> > However, this does not work for me and I suspect this is because of
> > a (another) gap in my understanding.
> >
> > At the interpreter
> >
> > [defined] stage1
> >
> > gives 0 or -1 as I would hope but I am unable to make progress when I
> > try and put it in a word.
> >
> > Can anyone put me out of my misery? Where am I going wrong?
> >
> > Kind regards and thanks,
> >
> > Tristan
> >
> >
> >
> >
> >
> --
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>
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everyone, including kids. Get more information and register today.
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