1%D \module 2%D [ file=back-ini, 3%D version=2009.04.15, 4%D title=\CONTEXT\ Backend Macros, 5%D subtitle=Initialization, 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 Backend Macros / Initialization} 15 16\registerctxluafile{back-ini}{} 17 18\unprotect 19 20%D Right from the start \CONTEXT\ had a backend system based on runtime pluggable 21%D code. As most backend issues involved specials and since postprocessors had not 22%D that much in common, we ended up with a system where we could switch backend as 23%D well as output code for multiple backends at the same time. 24%D 25%D Because \LUATEX\ has the backend built in, and since some backend issues have 26%D been moved to the frontend I decided to provide new backend code for \MKIV, 27%D starting with what was actually used. 28%D 29%D At this moment \DVI\ is no longer used for advanced document output and we 30%D therefore dropped support for this format. Future versions might support more 31%D backends again, but this has a low priority. 32 33\outputmode\plusone 34\let\outputmode\relax 35\newcount\outputmode 36\outputmode\plusone 37\let\normaloutputmode\outputmode 38 39%D The exact page model depends on the backend so we just define some variables that 40%D are used. A helper at the \LUA\ end will synchronize with the internal variables. 41%D We store these in the format. 42 43\ifdefined\everybackendshipout \else \newtoks\everybackendshipout \fi 44\ifdefined\everylastbackendshipout \else \newtoks\everylastbackendshipout \fi 45\ifdefined\everybackendlastinshipout \else \newtoks\everybackendlastinshipout \fi 46 47%D In \MKIV\ there is just one backend, \PDF, plus an additional export. We never 48%D came to seperate them, but \LMTX\ might do that. 49 50\installcorenamespace{backend} 51 52\installsetuponlycommandhandler \??backend {backend} 53 54%D \starttyping 55%D \setupbackend[space=yes] 56%D \stoptyping 57 58\appendtoks 59 \clf_setrealspaces{\backendparameter\c!space}% 60\to \everysetupbackend 61 62\appendtoks 63 \ifdefined\clf_resetmapfile 64 \clf_resetmapfile 65 \fi 66\to \everysetupbackend 67 68\unexpanded\def\setupoutput[#1]% 69 {\clf_enabledriver{#1}} 70 71\protect \endinput 72 |
