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hi,
"B. Gimeno" <nomail@nomail> wrote:
> "jr" <cre### [at] gmailcom> wrote:
> > ...
> > which version are you using? tried with alpha.10064268, but got no output.
> > ...
> Im sorry, it's my fault for going from a while-loop to a for-loop and pretending
> leaving it that nice. The first three exorcisms will not be charged to your
> monthly subscription account.
</grin>
(just as well, because I'm going to use up another. :-))
> ...
> FIXED:
> #macro Inv_String (S)
> #local C = strlen (S) ;
> #local I_S = concat ( #for(C,C,0) substr(S,C,1) #end )
> I_S
> #end
still does not work for me, sorry. afaict, without a (negative) step-size, the
'#for' won't decrement, as shown below. fwiw, I've included an
almost-variable-free version of the macro.
Script started on Thu 18 Jun 2020 20:58:36 BST
jr@swift:35:BGimeno$ c### [at] 200617pov
#version 3.8;
global_settings {assumed_gamma 1}
#declare sentence = "the quick brown fox jumped over the dog.";
// as posted.
#macro Inv_String(S)
#local C = strlen(S);
#local I_S = concat( #for(C,C,0) substr(S,C,1) #end )
I_S
#end
#debug concat("original: ", sentence, "\n",
"reversed: ", Inv_String(sentence), "\n")
#macro reverse_string(s_)
concat(#for(i_,strlen(s_),0,-1) substr(s_,i_,1) #end)
#end
#debug concat("original: ", sentence, "\n",
"reversed: ", reverse_string(sentence), "\n")
jr@swift:36:BGimeno$ povparse 200617.pov
Persistence of Vision(tm) Ray Tracer Version 3.8.0-alpha.10064268.unofficial
....
==== [Parsing...] ==========================================================
original: the quick brown fox jumped over the dog.
reversed:
original: the quick brown fox jumped over the dog.
reversed: .god eht revo depmuj xof nworb kciuq eht
File '200617-bg.pov' line 22: Parse Warning: No objects in scene.
==== [Rendering...] ========================================================
Rendered 1024 of 1024 pixels (100%)
POV-Ray finished
regards, jr.
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