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%D \module
%D [ file=strc-prc,
%D version=2008.10.20,
%D title=\CONTEXT\ Structure Macros,
%D subtitle=Processors,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright=PRAGMA-ADE / Hans Hagen]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
\writestatus{loading}{ConTeXt Structure Macros / Processors}
\registerctxluafile{strc-prc}{1.001}
\unprotect
%D Processors are used when we cannot easily associate typesetting directives
%D with (for instance) structural elements. Instead of ending up with numerous
%D additional definitions we can group treatments in so called processors.
%D
%D An example of where processors can be used is in separator sets (these are
%D related to typesetting numbers using structure).
%D
%D \starttyping
%D \defineprocessor[demo][style=\bfb,color=red]
%D \stoptyping
%D
%D This defines a processor named \type {demo}. Such a name ends up as prefix in
%D for instance:
%D
%D \starttyping
%D \definestructureseparatorset [demosep] [demo->!,demo->?,demo->!,demo->?] [demo->@]
%D \stoptyping
%D
%D Here the \type {!} and \type {?} are just the seperator characters that end
%D up between part, chapter, section, etc.\ numbers. The third argument defines the
%D default. When a separator is inserted, the \type{demo} processor will be applied.
%D Here the number will be separated by red slightly bigger than normal bold
%D exclamation marks and questionmarks
%D
%D Valid keys for defining a processor are \type {style}, \type {color}, \type {left},
%D \type {right}, and \type {command} (the given command takes one argument).
\def\defineprocessor
{\dodoubleargument\dodefineprocessor}
\def\dodefineprocessor[#1][#2]%
{\ifsecondargument
\letbeundefined{\??po#1\c!command}%
\ctxlua{structure.processors.register("#1")}%
\getparameters[\??po#1][\c!style=,\c!color=,\c!left=,\c!right=,#2]%
\else
\letbeundefined{\??po#1\c!style}%
\ctxlua{structure.processors.reset("#1")}%
\fi}
%D The following command can be used by users but normally it will be
%D invoked behind the screens. After all, processor prefixes need to
%D be split off first.
\unexpanded\def\applyprocessor#1%
{\ifcsname\??po#1\c!style\endcsname
\expandafter\dodoapplyprocessor
\else
\expandafter\secondoftwoarguments
\fi{#1}}
\def\dodoapplyprocessor#1#2%
{\begingroup
\dostartattributes{\??po#1}\c!style\c!color
\csname\??po#1\c!left\endcsname
\ifcsname\??po#1\c!command\endcsname
\csname\??po#1\c!command\endcsname{#2}%
\else
#2%
\fi
\csname\??po#1\c!right\endcsname
\dostopattributes
\endgroup}
\protect \endinput
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