1%D \module 2%D [ file=typo-prc, 3%D version=2008.10.20, 4%D title=\CONTEXT\ Structure Macros, 5%D subtitle=Processors, 6%D author=Hans Hagen, 7%D date=\currentdate, 8%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}] 9%C 10%C This module is part of the \CONTEXT\ macro||package and is 11%C therefore copyrighted by \PRAGMA. See mreadme.pdf for 12%C details. 13 14\writestatus{loading}{ConTeXt Typesetting Macros / Processors} 15 16%D For the moment manipulators are loaded here too, as they're in the same 17%D category as processors. This might change. (They are used in publications.) 18 19\registerctxluafile{typo-prc}{} 20\registerctxluafile{typo-man}{} 21 22\unprotect 23 24%D Processors are used when we cannot easily associate typesetting directives 25%D with (for instance) structural elements. Instead of ending up with numerous 26%D additional definitions we can group treatments in so called processors. 27%D 28%D An example of where processors can be used is in separator sets (these are 29%D related to typesetting numbers using structure). 30%D 31%D \starttyping 32%D \defineprocessor[demo][style=\bfb,color=red] 33%D \stoptyping 34%D 35%D This defines a processor named \type {demo}. Such a name ends up as prefix in 36%D for instance: 37%D 38%D \starttyping 39%D \defineseparatorset [demosep] [demo->!,demo->?,demo->!,demo->?] [demo->@] 40%D \stoptyping 41%D 42%D Here the \type {!} and \type {?} are just the seperator characters that end 43%D up between part, chapter, section, etc.\ numbers. The third argument defines the 44%D default. When a separator is inserted, the \type{demo} processor will be applied. 45%D Here the number will be separated by red slightly bigger than normal bold 46%D exclamation marks and questionmarks 47%D 48%D Valid keys for defining a processor are \type {style}, \type {color}, \type {left}, 49%D \type {right}, and \type {command} (the given command takes one argument). 50 51\installcorenamespace{processor} 52\installcorenamespace{processorcheck} 53 54\installcommandhandler \??processor {processor} \??processor 55 56\appendtoks 57 \letvalue{\??processorcheck\currentprocessor}\relax 58 {\currentprocessor}% global, but it permits using processor that are yet undefined 59\to \everydefineprocessor 60 61%D The following command can be used by users but normally it will be 62%D invoked behind the screens. After all, processor prefixes need to 63%D be split off first. At the \LUA\ end we do check for a processor 64%D being registered anyway. 65 66\unexpanded\def\applyprocessor#tag% 67 {\def\currentprocessor{#tag}% 68 \ifcsname\??processorcheck\currentprocessor\endcsname 69 \expandafter\typo_processor_apply 70 \else 71 \expandafter\firstofoneargument 72 \fi} 73 74\def\typo_processor_apply 75 {\edef\p_state{\processorparameter\c!state}% 76 \ifx\p_state\v!stop 77 \expandafter\firstofoneargument 78 \else 79 \expandafter\typo_processor_apply_indeed 80 \fi} 81 82\def\typo_processor_apply_indeed#content% 83 {\begingroup 84 \useprocessorstyleandcolor\c!style\c!color 85 \processorparameter\c!left 86 \processorparameter\c!command{#content}% 87 \processorparameter\c!right 88 \endgroup} 89 90%D \startbuffer 91%D \defineprocessor[first] [style=bold] 92%D \defineprocessor[last] [first] [color=red] 93%D 94%D \applyprocessor{first}{hans} \applyprocessor{last}{hagen} 95%D \stopbuffer 96%D 97%D \typebuffer \start \blank \getbuffer \blank \stop 98 99\protect \endinput 100 |
