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+%D \module
+%D   [       file=regi-ini,
+%D        version=2000.12.27, % 1998.12.03,
+%D          title=\CONTEXT\ Regime Macros,
+%D       subtitle=Initialization,
+%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.
+
+\unprotect
+
+%D Remark: regimes accumulate, so there is no explicit reset in
+%D mkii mode.
+
+%D Variables.
+
+\def\@reg@{@r@eg@} % regime prefix
+
+%D \macros
+%D   {currentregime}
+
+\let\currentregime\empty
+\let\defaultregime\s!default
+
+%D Some low level inheritance stuff (mkii).
+
+\def\doautosetregime#1#2%
+  {\ifnum#2>127
+     \expanded{\defineactivetoken #2 \@EA\noexpand\csname#1\endcsname}%
+   \fi}
+
+%D \macros
+%D   {startregime}
+%D
+%D Sometimes it makes sense to activate the characters in the
+%D upper half of the character table. Such a bundle of
+%D characters can be packages in a regime. Later we will see
+%D encodings (that links characters slots to glyphs) and
+%D mappings (that take care of hyphenation and case changes).
+%D
+%D When character~231 is of category code letter, it
+%D directly maps to glyph~231 (unless of course some virtual
+%D font is used). By making character~231 active, we can map
+%D it onto for instance the glyph in slot 233. This mapping
+%D can in itself be indirect, in the sense that it is for
+%D instance handled by an accent command.
+%D
+%D Regimes are implemented roughly the same as mappings, but
+%D enabled under different circumstances. In the future, the
+%D low level implementation may change.
+
+\def\startregime[#1]%
+  {\pushmacro\currentregime
+   \edef\currentregime{#1}%
+   \checkregimetoks}
+
+\def\checkregimetoks
+  {\doifundefined{\@reg@\currentregime}
+     {\@EA\newtoks\csname\@reg@\currentregime\endcsname}}
+
+\def\stopregime
+  {\popmacro\currentregime}
+
+\def\setregimetoks
+  {\checkregimetoks
+   \@EA\let\@EA\regimetoks\csname\@reg@\currentregime\endcsname}
+
+%D \macros
+%D   {defineactivedecimal, defineactivedecimals, defineactivetoken}
+%D
+%D The following commands are rather ugly ones. It makes a
+%D character active and assigns it a value. When expanded,
+%D the decimal number of the character is passed as first
+%D argument.
+%D
+%D \starttyping
+%D \def\decimalcharacter#1{\message{#1 is now active}}
+%D
+%D \defineactivedecimal 122 {\decimalcharacter}
+%D
+%D \defineactivedecimals 128 to 255 as {\decimalcharacter}
+%D \stoptyping
+%D
+%D This command is typically used in coding definitions,
+%D like the \UNICODE\ one.
+
+\def\dodefineactivedecimal#1#2% \unexpanded ? pdfdoc encoding
+  {\catcode#1\active
+   \scratchcounter\uccode\activehackcode
+   \uccode\activehackcode#1\relax
+   \uppercase{\unexpanded\edef~{\noexpand#2{\number#1}}}%
+   \uccode\activehackcode\scratchcounter}
+
+\long\def\defineactivedecimal#1 #2 %
+  {\setregimetoks
+   \regimetoks\expandafter{\the\regimetoks\dodefineactivedecimal{#1}{#2}}}
+
+\long\def\defineactivedecimals#1 to #2 as #3 %
+  {\setregimetoks
+   \dostepwiserecurse{#1}{#2}\plusone
+     {\regimetoks\@EA\@EA\@EA{\@EA\the\@EA\regimetoks\@EA\dodefineactivedecimal\@EA{\recurselevel}{#3}}}}
+
+\def\doexpandactivedecimal#1%
+  {\ifnum#1>\scratchcounter
+     \expandafter\gobbletwoarguments
+   \else
+     \noexpand\dodefineactivedecimal{#1}{\the\scratchtoks}%
+     \expandafter\expandafter\expandafter\doexpandactivedecimal\expandafter
+   \fi\expandafter{\the\numexpr#1+\plusone\relax}}
+
+\long\def\defineactivedecimals#1 to #2 as #3 %
+  {\setregimetoks
+   \scratchcounter#2\relax
+   \scratchtoks{#3}%
+   \expanded{\regimetoks{\the\regimetoks\doexpandactivedecimal{#1}}}%
+   \ignorespaces}
+
+\long\def\defineactivetoken #1 #2% no {} after #2, else no kern
+  {\setregimetoks
+   \regimetoks\expandafter{\the\regimetoks\defineactivecharacter#1 {#2}}}
+
+\long\def\defineactiveinspector #1 #2% watch the missing {}
+  {\setregimetoks
+   \regimetoks\expandafter{\the\regimetoks\defineactivecharacter#1 {#2}}}
+
+%D \macros
+%D   {defineregimesynonym,trueregimename}
+
+\def\defineregimesynonym
+  {\dodoubleargument\dodefineregimesynonym}
+
+\def\dodefineregimesynonym[#1][#2]%
+  {\setevalue{\@reg@:s:#1}{#2}}
+
+\def\trueregimename#1%
+  {\executeifdefined{\@reg@:s:#1}{#1}}
+
+%D \macros
+%D   {useregime}
+
+\def\useregime[#1]%
+  {\processcommalist[#1]\douseregime}
+
+\def\douseregime#1%
+  {\doifundefined{\c!file\f!regimeprefix#1}%
+     {\letgvalue{\c!file\f!regimeprefix#1}\empty
+      \makeshortfilename[\truefilename{\f!regimeprefix#1}]%
+      \startreadingfile
+        \readsysfile{\shortfilename.mkii}
+          {\showmessage\m!regimes2{#1}}
+          {\showmessage\m!regimes3{#1}}%
+      \stopreadingfile}}
+
+%D \macros
+%D   {enableregime,disableregime}
+
+\let\enabledregime\empty
+
+\def\enableregime[#1]%
+  {\edef\currentregime{\trueregimename{#1}}%
+   \doifelsenothing\currentregime
+     {\disableregime}
+     {\douseregime\currentregime
+      \the\executeifdefined{\@reg@\currentregime}\emptytoks}}
+
+\def\disableregime
+  {\let\currentregime\empty}
+
+%D \macros
+%D   {protectregime, settoletterunlessactive, settocodeunlessactive}
+%D
+%D The next boolean is used later on to prevent unwanted
+%D catcode changes. Use it with care.
+
+\newif\ifprotectregime \protectregimetrue
+
+\def\settoletterunlessactive#1%
+  {\ifprotectregime\ifnum\catcode#1=\active\else
+     \catcode#1\@@letter
+   \fi\else
+     \catcode#1\@@letter
+   \fi}
+
+\def\settootherunlessactive#1%
+  {\ifprotectregime\ifnum\catcode#1=\active\else
+     \catcode#1=\@@other
+   \fi\else
+     \catcode#1=\@@other
+   \fi}
+
+\def\settocodeunlessactive#1#2%
+  {\ifprotectregime\ifnum\catcode#1=\active\else
+     \catcode#1=#2\relax
+   \fi\else
+     \catcode#1=#2\relax
+   \fi}
+
+%D Goodie:
+
+\def\showregime[#1]%
+  {\doifnot{#1}{utf}
+     {\bgroup
+      \enableregime[#1]%
+      \starttabulate[|l|l|l|]
+      \dostepwiserecurse{128}{255}{1}
+        {\expanded
+           {\scantokens
+              {\NC \recurselevel
+               \NC \rawcharacter\recurselevel
+               \NC \noexpand\tttf
+                   \noexpand\meaning\rawcharacter\recurselevel \NC \NR}}}%
+      \stoptabulate
+      \unskip
+      \egroup}}
+
+%D Sort related:
+
+\def\dowalkregime#1%
+  {\the\executeifdefined{\@reg@#1}\emptytoks}
+
+%D Simplify matters for \XETEX.
+
+\ifnum\texengine=\xetexengine
+
+    \def\enableregime[#1]%
+      {\doifelse{#1}{utf}%
+         {\writestatus\m!regimes{mapping utf to utf-8}%
+          \XeTeXinputencoding{utf-8}}
+         {\XeTeXinputencoding{#1}}}
+
+    \def\disableregime
+      {\XeTeXinputencoding{utf-8}}
+
+    \def\loadregime[#1]{}
+    \let\walkregime      \gobbleoneargument
+    \let\doautosetregime \gobbletwoarguments
+
+\else
+
+    \useregime[def,uni,utf] % we load the rest runtime
+
+\fi
+
+\protect \endinput