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%D \module
%D [ file=syst-str,
%D version=2006.09.18,
%D title=\CONTEXT\ System Macros,
%D subtitle=String Processing,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA / Hans Hagen \& Ton Otten}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
\unprotect
% nb: these macros might go away !
%
% todo: escape special chars in expr (\luaescapeexpression)
%D I got tired of making dedicated clean up macros using the
%D same mechanism again and again, so now we have:
%D
%D \starttyping
%D \def\xxxx{abc.d} \replacecharacters\xxxx{a.}{-} \xxxx
%D \stoptyping
\def\replacecharacters#1#2#3% macro characters replacement
{\dodoglobal\edef#1{\ctxlua{tex.sprint((string.gsub(\!!bs#1\!!es,\!!bs#2\!!es,"#3")))}}}
\def\separatestring#1\to#2%
{\dodoglobal\def#2{\ctxlua{tex.sprint((string.gsub(\!!bs#1\!!es,"\letterpercent s+",",")))}}}
\def\unspacefilename#1\to#2%
{\dodoglobal\def#2{\ctxlua{tex.sprint((string.gsub(\!!bs#1\!!es,"\letterpercent s+","-")))}}}
\protect \endinput
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