%D \module
%D   [       file=catc-sym,
%D        version=1997.01.03, % moved code
%D          title=\CONTEXT\ Catcode Macros,
%D       subtitle=Some Handy Constants,
%D         author=Hans Hagen,
%D           date=\currentdate,
%D      copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.

%D The following definitions can be used for mapping special characters onto
%D letters, although we cheat a bit: they actually are of category other but
%D for users that distinction doesn't matter here. The definitions in \MKII\
%D and \MKIV\ look more impressive but here we use a \LUAMETATEX\ feature
%D that permits a more direct definition (that also looks nice with the
%D \CONTEXT\ syntax highlighting):

\immutable\edef\letterleftbrace        {\expandtoken \othercatcode \leftbraceasciicode}
\immutable\edef\letterrightbrace       {\expandtoken \othercatcode \rightbraceasciicode}
\immutable\edef\letterampersand        {\expandtoken \othercatcode \ampersandasciicode}
\immutable\edef\letterless             {\expandtoken \othercatcode \lessthanasciicode}
\immutable\edef\lettermore             {\expandtoken \othercatcode \morethanasciicode}
\immutable\edef\letterhash             {\expandtoken \othercatcode \hashasciicode}
\immutable\edef\letterdoublequote      {\expandtoken \othercatcode \doublequoteasciicode}
\immutable\edef\lettersinglequote      {\expandtoken \othercatcode \singlequoteasciicode}
\immutable\edef\letterdollar           {\expandtoken \othercatcode \dollarasciicode}
\immutable\edef\letterpercent          {\expandtoken \othercatcode \percentasciicode}
\immutable\edef\letterhat              {\expandtoken \othercatcode \circumflexasciicode}
\immutable\edef\letterunderscore       {\expandtoken \othercatcode \underscoreasciicode}
\immutable\edef\letterbar              {\expandtoken \othercatcode \barasciicode}
\immutable\edef\lettertilde            {\expandtoken \othercatcode \tildeasciicode}
\immutable\edef\letterbackslash        {\expandtoken \othercatcode \backslashasciicode}
\immutable\edef\letterslash            {\expandtoken \othercatcode \forwardslashasciicode}
\immutable\edef\letterquestionmark     {\expandtoken \othercatcode \questionmarkasciicode}
\immutable\edef\letterexclamationmark  {\expandtoken \othercatcode \exclamationmarkasciicode}
\immutable\edef\letterat               {\expandtoken \othercatcode \atsignasciicode}
\immutable\edef\lettercolon            {\expandtoken \othercatcode \colonasciicode}
\immutable\edef\letterhyphen           {\expandtoken \othercatcode \hyphenasciicode}

\immutable\edef\letterleftparenthesis  {\expandtoken \othercatcode \leftparentasciicode}
\immutable\edef\letterrightparenthesis {\expandtoken \othercatcode \rightparentasciicode}
\immutable\edef\letterleftbracket      {\expandtoken \othercatcode \leftbracketasciicode}
\immutable\edef\letterrightbracket     {\expandtoken \othercatcode \rightbracketasciicode}

\aliased\let\letterescape    \letterbackslash
\aliased\let\letterbgroup    \letterleftbrace
\aliased\let\letteregroup    \letterrightbrace
\aliased\let\letteropenbrace \letterleftbrace
\aliased\let\letterclosebrace\letterrightbrace

\unprotect

%immutable\edef\s!n_u_l_token{\expandtoken \othercatcode \zerocount} % nul(l)
%immutable\edef\s!s_o_h_token{\expandtoken \othercatcode \plusone  } % start of header       ^^^^0001
%immutable\edef\s!s_t_x_token{\expandtoken \othercatcode \plustwo  } % start of text         ^^^^0002
%immutable\edef\s!e_t_x_token{\expandtoken \othercatcode \plusthree} % end of text           ^^^^0003
\immutable\edef\s!e_o_t_token{\expandtoken \othercatcode \plusfour } % end of transmission   ^^^^0004
%immutable\edef\s!e_n_q_token{\expandtoken \othercatcode \plusfive } % enquiry
%immutable\edef\s!a_c_k_token{\expandtoken \othercatcode \plussix  } % aknowledgement

\protect

%D \macros
%D   {setnormalcatcodes,uncatcodespacetokens}
%D
%D The following macros are more or less replaced by switching to a catcode table
%D (which we simulate in \MKII) but we keep them for convenience and compatibility.
%D Some old engine code has been removed. A few ar still used a few times so I need
%D to clean that up.

\permanent\protected\def\setnormalcatcodes
  {\setcatcodetable\ctxcatcodes} % maybe \texcatcodes

\permanent\protected\def\uncatcodespacetokens
  {\catcode\spaceasciicode    \spacecatcode
   \catcode\tabasciicode      \spacecatcode
   \catcode\formfeedasciicode \endoflinecatcode
   \catcode\endoflineasciicode\endoflinecatcode
   \catcode\delasciicode      \ignorecatcode}

%D These two are probably no longer needed, but we keep them for a while. Some more
%D explanation can be foun din the mkiv variant of this module, where we also
%D discuss side effects. It's time to move on, so these might go away some day.

\aliased  \let\rescan              \scantextokens
\permanent\def\rescanwithsetup#1#2{\begingroup\directsetup{#1}\scantextokens{#2}\endgroup}

\endinput