[NTG-context] Macros which scan subscripts/superscripts in ConTeXt

[Jairo A. del Rio]

Hi, list! I've seen the following in Stack Exchange:

https://tex.stackexchange.com/questions/503208/define-macro-that-scans-ahead-for-super-and-or-subscript-absorbs-them-and-mo

The answer is:

\documentclass{article}\usepackage{amsmath}\usepackage{xparse}
\NewDocumentCommand{\mymathsym}{e{^_}}{%
  x^{\mathrm{foo}\IfValueT{#1}{,#1}}_{\mathrm{bar}\IfValueT{#2}{,#2}}%}
\begin{document}
\begin{gather}\mymathsym \\\mymathsym^{\mathrm{extrasup}}
\\\mymathsym_{\mathrm{extrasub}}
\\\mymathsym^{\mathrm{extrasup}}_{\mathrm{extrasub}}
\\\mymathsym_{\mathrm{extrasub}}^{\mathrm{extrasup}}   \end{gather}
\end{document}

Such a macro contextually defines a behavior for a subscript and a
superscript even if they aren't displayed in a specific order, so

\mymacro_{a}^{b}

\mymacro^{b}_{a}


have the same output, even if the intended behavior is not the typical
one (I could redefine it so subscripts change colors, for instance).
Although I could just port the macro using xparse-generic because it
works in ConTeXt too, how to define a macro like that the ConTeXt way,
i.e., using only ConTeXt macros?

Thank you in advance.

Jairo :)
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