On 18/04/2018 16:08, Bruno Le Floch wrote:
Hello,I suggest allowing \Ucharcat to produce active characters. See three-line patch attached. This would allow to produce active characters expandably in all engines (pdfTeX, luaTeX, XeTeX, pTeX, upTeX). My code makes \Ucharcat `~ 13 \expandafter\show\Ucharcat `~ 13 \edef\foo{\expandafter\noexpand\Ucharcat `~ 13 } run the code of the active ~ as if it had been typed directly, then show its meaning, then do the equivalent of \def\foo{~}. Bruno
In case anyone wonders: only XeTeX has \Ucharcat. In LuaTeX we can make char tokens from the 'Lua side', so are unrestricted in terms of catcode. In pdfTeX and (u)pTeX, assuming we are only dealing with the 8-bit range (upTeX) it's feasible to pre-generate all combinations and use expandable macros to output the tokens.
Joseph -------------------------------------------------- Subscriptions, Archive, and List information, etc.: http://tug.org/mailman/listinfo/xetex
