[NTG-context] Re: \ifnum with two \recurselevel

9 May 2025


      On 5/9/2025 5:41 AM, Pablo Rodriguez via ntg-context wrote:
...
On 5/8/25 21:02, Hans Hagen via ntg-context wrote:
...
[...]
These % after the comparison make tex scan on for the end of a number (a
\relax of space ends the scan). You can do this:
Many thanks for your reply, Hans.
With your sample, I see that some crazy things (such as the following)
are possible:
\starttext
   \dorecurse{2}{%
     \dorecurse{3}{%
       \dorecurse{4}{%
         \dorecurse{5}{%
           \dorecurse{6}{%
             #1:##1:####1:########1:################1 }\\
   }\blank[.25st]}\blank[.5st]}\blank[1st]}
   \stoptext
I mean, accessing different levels of recursion in nested loops.
Being a very special trick for really corner cases, is there something
to be considered when using it?
only imagination ... try #2 ##2 etc .. these #1 things are basically 
references to macro arguments

\dorecurse{1}{%
     \dorecurse{3}{%
         \dorecurse{3}{%
             \dorecurse{3}{%
                 \dorecurse{3}{%
                   % #1:##1:####1:########1:################1
                     #2:##2:####2:########2:################2
                 }\\
             }
             \blank[.25st]
         }
         \blank[.5st]
     }
     \blank[1st]
}

\page

or go wild with

\localcontrolledrepeat 1 {
     \localcontrolledrepeat 3 {
         \localcontrolledrepeat 3 {
             \localcontrolledrepeat 3 {
                 \localcontrolledrepeat 3 {
                     \the\previousloopiterator4:%
                     \the\previousloopiterator3:%
                     \the\previousloopiterator2:%
                     \the\previousloopiterator1:%
                     \the\previousloopiterator0 %
                 }\\
             }
             \blank[.25st]
         }
         \blank[.5st]
     }
     \blank[1st]
}

\page

or maybe:

\edef\foo{%
\expandedrepeat 1 {
     \expandedrepeat 3 {
         \expandedrepeat 3 {
             \expandedrepeat 3 {
                 \expandedrepeat 3 {
                     \the\previousloopiterator4:%
                     \the\previousloopiterator3:%
                     \the\previousloopiterator2:%
                     \the\previousloopiterator1:%
                     \the\previousloopiterator0 %
                 }\\
             }
             \blank[.25st]
         }
         \blank[.5st]
     }
     \blank[1st]
}
}

\foo

\meaningfull\foo

enough in there for a rainy day

Hans

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