[NTG-context] Changed behavior of ^^ in csname

[Marcel Fabian Krüger]

On Thu, Jun 11, 2020 at 10:07:34AM +0200, Hans Hagen wrote:
> On 6/11/2020 4:06 AM, Marcel Fabian Krüger wrote:
> > Hi,
> > 
> > I noticed that in the latest LMTX version, ^^ (with ^ of catcode 7)
> > is no longer interpreted inside csnames. Is this intentional?
> > 
> > (Example:
> > 
> > \starttext
> > \catcode\circumflexasciicode=\superscriptcatcode% Ensure correct catcodes
> > 
> > \show ^^41 % This still works and shows "> the letter A"
> > 
> > \show^^41 % This used to be an error "Undefined control sequence \showA",
> >            % now show "> The letter A"
> > 
> > \show\^^41 % Used to show "> \A=undefined", now shows "> \^=macro:->\enco_handle_accent {^}"
> >             % and "! Missing $ inserted"
> > \stoptext
> > 
> > )
> Indeed that is intentional because in lmtx we disable them (partially). You
> have to say:
> 
> \normalsupmarkmode\zerocount % we use 1 as default in lmtx

Hi,

shouldn't \supmarkmode=1 only disable these in math mode?
In any case, \normalsupmarkmode\zerocount doesn't make a difference
here:

\starttext
\normalsupmarkmode\zerocount
\catcode\circumflexasciicode=\superscriptcatcode% Ensure correct catcodes

\show ^^41 % This still works and shows "> the letter A"

\show^^41 % This used to be an error "Undefined control sequence \showA",
           % now show "> The letter A"

\show\^^41 % Used to show "> \A=undefined", now shows "> \^=macro:->\enco_handle_accent {^}"
            % and "! Missing $ inserted"
\stoptext

shows exactly the same behavior.


Best regards,
Marcel

> 
> This is because in lmtx we have native prescript support, as in:
> 
>   $ x^{rt}_{rb}^^{lt}__{lb} $
> 
> so, double _ ^ can have a different meaning there.
> 
> Hans
> 
> 
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