[XeTeX] defining \semitichalign based on \halign primitive

[وفا خلیقی، Vafa Khalighi]

Is it possible in the macro level to define a CS  called \semitichalign based on \halign such that this \semitichalign such that it sets the columns of tables from Right to Left?

In LaTeX there are too many packages and it is a pain to patch every single package but if there was a primitive \semitichalign or if it could be defined in terms of macros such that it could put columns of tables from right to left, the it would be so easy to get rid of annoying table problem in RTL

\let\origin at halign=\halign
\def\halign{\if at RTL\semitichalign\else\origin at halign\fi}


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