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%D \module
%D [ file=supp-pat,
%D version=2005.02.12,
%D title=\CONTEXT\ Support Macros,
%D subtitle=Patterns,
%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 We support:
%D
%D \starttyping
%D \patterns {
%D ...[namedglyphs]...
%D }
%D \stoptyping
%D
%D as well as:
%D
%D \starttyping
%D <patterns>
%D ...&namedglyphs;...
%D </patterns>
%D \stoptyping
%D
%D The \XML\ variant has very limited \XML\ parsing capabilities and
%D is meant as an experiment.
\ifx\writestatus\undefined \else
\writestatus{loading}{ConTeXt Support Macros / Patterns}
\fi
%D \CONTEXT:
\ifx\startmapping\undefined \else \ifx\startencoding\undefined \else
\def\fetchpatterntoken#1{\csname#1\endcsname}
\fi \fi
%D First we define the \ETEX\ variant. We cannot do that inside
%D the if statement because normal \TEX\ gets confused over the
%D csname test (which it does not see as if but it does see the
%D else's and fi's).
\def\etexfetchpatterntoken#1%
{\csname
\ifcsname @pattok@#1\endcsname
@pattok@#1%
\else\ifcsname#1\endcsname
#1%
\else
@pattok@default%
\fi\fi
\endcsname}
\ifx \fetchpatterntoken \undefined
\ifx \eTeXversion \undefined
\def\fetchpatterntoken#1%
{\csname
\expandafter\ifx\csname @pattok@#1\endcsname\relax
\expandafter\ifx\csname#1\endcsname\relax
@pattok@default%
\else
#1%
\fi
\else
@pattok@#1%
\fi
\endcsname}
\else
\let\fetchpatterntoken\etexfetchpatterntoken
\fi
\fi
\def\definepatterntoken #1 #2 %
{\expandafter\def\csname @pattok@#1\endcsname{#2}}
%D \TEX\ based:
\bgroup \catcode`\[=\active
\gdef\enablepatterntokens
{\catcode`\[=\active \let[\handlepatterntoken}
\egroup
\def\handlepatterntoken#1]%
{\fetchpatterntoken{#1}}
%D \XML\ based:
\bgroup \catcode`\<=\active \catcode`\&=\active
\gdef\enablepatternxml
{\catcode`\<=\active
\catcode`\&=\active
\let&\handlepatternentity
\let<\handlepatternxml}
\egroup
\def\handlepatternentity#1;%
{\fetchpatterntoken{#1}}
%D We use a very simple \XML\ parser, and we only trigger on the first
%D two characters of the tag name. Consider this feature a playground
%D (and a bit of a joke).
\def\handlepatternxml#1#2% we only distinguish the first two chars
{\csname @patxml@\ifcsname @patxml@#1#2\endcsname#1#2\else de\fi\endcsname}
\def\definepatternxml #1#2#3 #4%
{\expandafter\def\csname @patxml@#1#2\endcsname{#4}}
\def\fetchpatternxml#1#2>%
{\bgroup
\long\def\next##1>{\egroup}%
\catcode`\<=2 % \@@endgroup
\afterassignment\next
#1\bgroup}
\def\gobblepatternxml
{\bgroup
\catcode`\%=11
\dogobblepatternxml}
\long\def\dogobblepatternxml#1>%
{\egroup}
%D Here are the default definitions. We don't catch empty elements.
\definepatternxml patterns {\fetchpatternxml\patterns}
\definepatternxml hyphenations {\fetchpatternxml\hyphenation}
\definepatternxml pattern {\fetchpatternxml\patterns}
\definepatternxml hyphenation {\fetchpatternxml\hyphenation}
\definepatternxml default {\gobblepatternxml}
\definepatterntoken default x
\ifx\pattern \undefined \let\pattern \patterns \fi
\ifx\hyphenations\undefined \let\hyphenations\hyphenation \fi
%D An example of usage in another format than \CONTEXT:
%D
%D \starttyping
%D \bgroup
%D
%D \lccode"E4="E4 \definepatterntoken adiaeresis ^^e4
%D \lccode"F6="F6 \definepatterntoken odiaeresis ^^f6
%D \lccode"FC="FC \definepatterntoken ediaeresis ^^fc
%D \lccode"FF="FF \definepatterntoken ssharp ^^ff
%D
%D \enablepatterntokens
%D \enablepatternxml
%D
%D \input lang-de.pat
%D \input lang-de.hyp
%D
%D \egroup
%D \stoptyping
%D
%D This is a minimal example for EC encoding, and of course
%D a couple of more language related settings need to take
%D place (like uc mappings).
\endinput
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