[NTG-context] mp strings

[Hans Hagen]

Hi,

The *next* lmtx upload (one of these days) will have a small extension 
to the mp library wrt strings. In order to be more " neutral the string 
can be bound by STX/EOT characters (enabled by default). In addition to 
that there is also an option to set the catcode regime. The combination 
of these permits passing and processing strings as-they-are. Just in 
case the Gerbens among us need it.

Hans

==================== example =====================

\startTEXpage

     \def\foo{x}

     \framed{\startMPcode
         interim catcoderegime := vrbcatcoderegime ;
         draw textext("stream $\string\foo$") withcolor "darkred" ;
     \stopMPcode}

     \framed{\startMPcode
         draw textext("stream $\foo$") withcolor "darkblue" ;
     \stopMPcode}

     \startlmtxmode

         % here the string starts with ascii code 2 (STX) and ends with
         % ascii code 3 (EOT) ... visibility depends on the editor and 

         % font used; these are normally not used and therefore nice
         % alternative string capsules 	

         \framed{\startMPcode
             interim catcoderegime := vrbcatcoderegime ;
             draw textext(stream $\string\foo$) withcolor "darkgreen" ;
         \stopMPcode}

         \framed{\startMPcode
             draw textext(stream $\foo$) withcolor "darkyellow" ;
         \stopMPcode}

     \stoplmtxmode

\stopTEXpage


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