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Dirty trick is to add filter before POV parser, but connected to it
(with access to parser's namespace).
With includes you have good idea. I tried this:
#declare Include="colors.inc"
#include Include
sphere {
<0, 0, 0>, 1
texture {
pigment {color Red}
finish {ambient 1}
}
}
and it works. Thus import macro can get string as its parameter.
Disnel
Warp wrote:
>
> How hard would it be to implement this feature:
>
> If an identifier appears in the script with a certain syntax, eg:
>
> `identifier` or $identifier$ or #identifier# or whatever,
>
> then that expression is substituted with the value of the identifier and
> then parsing is continued exactly as if that value had been written
> explicitly in that place.
> For example (supposing that we use for example the $$ notation) this:
>
> #declare MyIdentifier = "Another"
> #declare $MyIdentifier$ = 5;
> #declare Something$Another$ = <1,2,3>;
>
> would be parsed exactly as if we had written:
>
> #declare MyIdentifier = "Another"
> #declare Another = 5;
> #declare Something5 = <1,2,3>;
>
> Why I propose this?
> There is a discussion in povray.general (IIRC) about how to avoid unnecessary
> parsing of include files that are #included more than once.
> I thought that perhaps a macro could be done to automatize the ignoring
> of repeated. This macro could be used like:
>
> import("myinclude.inc")
>
> which would #include "myinclude.inc" only if it wasn't included before.
>
> It's not easy to implement this macro with the current povray script.
> Perhaps simulating some dynamic array and searching that array could be
> done, but that's hard to do and very slow when there are lots of includes.
> Then I thought about the feature I propose here. The macro could be done
> like:
>
> #macro import(file)
> #local ID = strreplace(file, ".", "_");
> #ifndef(_INCLUDED_$ID_)
> #declare _INCLUDED_$ID$_
> #include file
> #end
> #end
>
> (Note also the need for a 'strreplace' function or macro...)
>
> --
> main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
> ):_;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/
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