diff options
Diffstat (limited to 'tex/context/base/supp-mis.tex')
| -rw-r--r-- | tex/context/base/supp-mis.tex | 451 |
1 files changed, 451 insertions, 0 deletions
diff --git a/tex/context/base/supp-mis.tex b/tex/context/base/supp-mis.tex new file mode 100644 index 000000000..954180bfc --- /dev/null +++ b/tex/context/base/supp-mis.tex @@ -0,0 +1,451 @@ +%D \module +%D [ file=supp-mis, +%D version=1997.01.04, +%D title=\CONTEXT\ Support Macros, +%D subtitle=Missing (For Generic Use), +%D author=Hans Hagen, +%D date=\currentdate, +%D copyright={PRAGMA / Hans Hagen \& Ton Otten}] +%C +%C This module is part of the \CONTEXT\ macro||package and is +%C therefore copyrighted by \PRAGMA. Non||commercial use is +%C granted. + +%D Some support modules are more or less independant. This +%D module, which is not part of plain \CONTEXT, provides the +%D missing macros and declarations of registers. + +\ifx \undefined \writestatus \else \expandafter \endinput \fi + +%D \macros +%D {ifnocontextobject} +%D +%D First we take care of redundant defining. The next set of +%D macros are a bit complicated by the fact that Plain +%D \TEX\ defines the \type{\new}||macros as being outer. +%D Furthermore nested \type{\if}'s can get us into +%D trouble. + +\def\definecontextobject% + {\iftrue} + +\def\gobblecontextobject% + {\setbox0=\hbox + \bgroup + \long\def\gobblecontextobject##1\fi{\egroup}% + \expandafter\gobblecontextobject\string} + +\long\def\ifnocontextobject#1\do% + {\ifx#1\undefined + \let\next=\definecontextobject + \else + %\writestatus{system}{beware of conflicting \string#1}% + \let\next=\gobblecontextobject + \fi + \next} + +%D \macros +%D {beginETEX,beginTEX} +%D +%D Outside \CONTEXT\ we will not be \ETEX||aware. + +\long\def\beginETEX#1\endETEX{} + +\let\beginTEX\relax \let\endTEX\relax + +%D \macros +%D {writestatus} +%D +%D We start each module with a message. Normally the output is +%D formatted, but here we keep things simple. + +\ifnocontextobject \writestatus \do + + \def\writestatus#1#2% + {\immediate\write16{#1 : #2}} + +\fi + +%D Lets see if it works. + +\writestatus{loading}{Context Support Macros / Missing} + +%D \macros +%D {protect,unprotect} +%D +%D Next we present a poor mans alternative for \type{\protect} +%D and \type{\unprotect}, two commands that enable us to use +%D the characters \type{@}, \type{!} and \type{?} in macro +%D names. + +\ifnocontextobject \protect \do + + \let\protect=\relax + +\fi + +\newcount\protectiondepth + +\ifnocontextobject \unprotect \do + + \def\unprotect% + {\advance\protectiondepth 1 + \ifnum\protectiondepth=1 + \let\normalprotect=\protect + \def\protect% + {\ifnum\protectiondepth>0 + \advance\protectiondepth -1 + \ifnum\protectiondepth=0 + \doprotect + \let\protect=\normalprotect + \fi + \fi} + \edef\doprotect% + {\catcode`\noexpand @=\the\catcode`@\relax + \catcode`\noexpand !=\the\catcode`!\relax + \catcode`\noexpand ?=\the\catcode`?\relax} + \catcode`@=11 + \catcode`!=11 + \catcode`?=11 + \fi} + +\fi + +%D We start using this one it at once. + +\unprotect + +%D \macros +%D {scratch...,if...,next...} +%D +%D We need some scratch registers. Users are free to use them, +%D but can never be sure of their value once another macro is +%D called. We only allocate things when they are yet +%D undefined. This way we can't mess up other macro packages, +%D but of course previous definitions can mess up our modules. + +\ifnocontextobject \scratchcounter \do \newcount \scratchcounter \fi +\ifnocontextobject \scratchdimen \do \newdimen \scratchdimen \fi +\ifnocontextobject \scratchskip \do \newskip \scratchskip \fi +\ifnocontextobject \scratchmuskip \do \newmuskip \scratchmuskip \fi +\ifnocontextobject \scratchbox \do \newbox \scratchbox \fi +\ifnocontextobject \scratchread \do \newread \scratchread \fi +\ifnocontextobject \scratchwrite \do \newwrite \scratchwrite \fi + +\ifnocontextobject \nextbox \do \newbox \nextbox \fi + +\ifnocontextobject \nextdepth \do \newdimen \nextdepth \fi + +\ifnocontextobject \CONTEXTtrue \do \newif\ifCONTEXT \fi +\ifnocontextobject \donetrue \do \newif\ifdone \fi +\ifnocontextobject \eightbitcharacterstrue \do \newif\ifeightbitcharacters \fi +\ifnocontextobject \MPdrawingdonetrue \do \newif\ifMPdrawingdone \fi + +%D \macros +%D {@@...} +%D +%D We use symbolic name for \CATCODES. They can only be used +%D when we are in unprotected state. + +\ifnocontextobject \@@escape \do \chardef\@@escape = 0 \fi +\ifnocontextobject \@@begingroup \do \chardef\@@begingroup = 1 \fi +\ifnocontextobject \@@endgroup \do \chardef\@@endgroup = 2 \fi +\ifnocontextobject \@@endofline \do \chardef\@@endofline = 5 \fi +\ifnocontextobject \@@ignore \do \chardef\@@ignore = 9 \fi +\ifnocontextobject \@@space \do \chardef\@@space = 10 \fi +\ifnocontextobject \@@letter \do \chardef\@@letter = 11 \fi +\ifnocontextobject \@@other \do \chardef\@@other = 12 \fi +\ifnocontextobject \@@active \do \chardef\@@active = 13 \fi +\ifnocontextobject \@@comment \do \chardef\@@comment = 14 \fi + +%D \macros +%D {everyline,EveryLine,EveryPar} +%D +%D In \CONTEXT\ we use \type{\everypar} for special purposes +%D and provide \type{\EveryPar} as an alternative. The same +%D goes for \type{\everyline} and \type{\EveryLine}. + +\ifnocontextobject \everyline \do \newtoks\everyline \fi +\ifnocontextobject \EveryPar \do \let\EveryPar =\everypar \fi +\ifnocontextobject \EveryLine \do \let\EveryLine=\everyline \fi + +%D \macros +%D {!!...} +%D +%D We reserve ourselves some scratch strings (i.e. macros) +%D and some more counters. + +\ifnocontextobject \!!stringa \do \def\!!stringa {} \fi +\ifnocontextobject \!!stringb \do \def\!!stringb {} \fi +\ifnocontextobject \!!stringc \do \def\!!stringc {} \fi +\ifnocontextobject \!!stringd \do \def\!!stringd {} \fi + +\ifnocontextobject \!!counta \do \newcount\!!counta {} \fi +\ifnocontextobject \!!countb \do \newcount\!!countb {} \fi + +%D \macros +%D {!!...} +%D +%D The next set of definitions speed up processing a bit. +%D Furthermore it saves memory. + +\ifnocontextobject \!!zeropoint \do \def\!!zeropoint {0pt} \fi +\ifnocontextobject \!!tenthousand \do \def\!!tenthousand {10000} \fi + +\ifnocontextobject \!!width \do \def\!!width {width} \fi +\ifnocontextobject \!!height \do \def\!!height {height} \fi +\ifnocontextobject \!!depth \do \def\!!depth {depth} \fi + +\ifnocontextobject \!!plus \do \def\!!plus {plus} \fi +\ifnocontextobject \!!minus \do \def\!!minus {minus} \fi +\ifnocontextobject \!!to \do \def\!!to {to} \fi + +%D \macros +%D {smashbox} +%D +%D The system modules offer a range of smashing macros, of +%D which we only copied \type{\smashbox}. + +\ifnocontextobject \smashbox \do + + \def\smashbox#1% + {\wd#1=\!!zeropoint + \ht#1=\!!zeropoint + \dp#1=\!!zeropoint} + +\fi + +%D \macros +%D {dowithnextbox} +%D +%D Also without further comment, we introduce a macro that +%D gets the next box and does something usefull with it. +%D Because the \type{\afterassignment} is executed inside the +%D box, we have to use a \type{\aftergroup} too. + +\ifnocontextobject \dowithnextbox \do + + \def\dowithnextbox#1% + {\def\dodowithnextbox{#1}% + \afterassignment\dododowithnextbox + \setbox\nextbox} + + \def\dododowithnextbox% + {\aftergroup\dodowithnextbox} + +\fi + +%D \macros +%D {setvalue,getvalue,letvalue,setgvalue} +%D +%D The next two macros expand their argument to +%D \type{\argument}. The first one is used to define macro's +%D the second one executes them. + +\ifnocontextobject \setvalue \do + + \def\setvalue #1{\expandafter\def\csname#1\endcsname} + \def\getvalue #1{\csname#1\endcsname} + \def\letvalue #1{\expandafter\let\csname#1\endcsname} + \def\setgvalue#1{\expandafter\gdef\csname#1\endcsname} + +\fi + +%D \macros +%D {unexpanded} +%D +%D The next command can be used as prefixed for commands that +%D need protection during tests and writing to files. This +%D is a very \CONTEXT\ specific one. + +\ifnocontextobject \unexpanded \do + + \let\unexpanded=\relax + +\fi + +%D \macros +%D {convertargument} +%D +%D The original one offers a bit more, like global assignment, the +%D the next implementation is however a bit more byte saving. + +\ifnocontextobject \convertargument \do + + \def\doconvertargument#1>{} + + \long\def\convertargument#1\to#2% + {\long\def\convertedargument{#1}% + \edef#2{\expandafter\doconvertargument\meaning\convertedargument}} + +\fi + +%D \macros +%D {forgetall} +%D +%D Sometimes we have to disable interference of whatever kind +%D of skips and mechanisms. The next macro resets some. + +\ifnocontextobject \forgetall \do + + \def\forgetall% + {\parskip\!!zeropoint + \leftskip\!!zeropoint + \parindent\!!zeropoint + \everypar{}} + +\fi + +%D \macros +%D {withoutpt} +%D +%D \TEX\ lacks some real datastructure. We can however use +%D \DIMENSIONS. This kind of trickery is needed when we want +%D \TEX\ to communicate with the outside world (by means of +%D \type{\specials}). + +\ifnocontextobject \withoutpt \do + + {\catcode`\.=\@@other + \catcode`\p=\@@other + \catcode`\t=\@@other + \gdef\WITHOUTPT#1pt{#1}} + + \def\withoutpt#1% + {\expandafter\WITHOUTPT#1} + + \def\ScaledPointsToBigPoints#1#2% + {\scratchdimen=#1sp\relax + \scratchdimen=.996264\scratchdimen + \edef#2{\withoutpt{\the\scratchdimen}}} + +\fi + +%D \macros +%D {doprocessfile} +%D +%D This macro takes three arguments: the file number, the +%D filename and a macro that handles the content of a read +%D line. + +\newif\iffileprocessed + +\ifnocontextobject \doprocessfile \do + + \def\doprocessfile#1#2#3% + {\openin#1=#2\relax + \ifeof#1% + \fileprocessedfalse + \closein#1\relax + \else + \fileprocessedtrue + \gdef\dofinishfile% + {\closein#1\relax + \global\let\doprocessline=\relax}% + \gdef\doprocessline% + {\ifeof#1% + \dofinishfile + \else + \global\read#1 to \fileline + #3\relax + \expandafter\doprocessline + \fi}% + \expandafter\doprocessline + \fi} + +\fi + +%D \macros +%D {uncatcodespecials} +%D +%D This one is taken from the \TEX\ book. The \CONTEXT\ +%D alternative is a bit different, but we hope this one works +%D here. + +\ifnocontextobject \uncatcodespecials \do + + \def\uncatcodespecials% + {\def\do##1{\catcode`##1=12 }\dospecials} + +\fi + +\ifnocontextobject \setnaturalcatcodes \do + +\def\setnaturalcatcodes% + {\catcode`\!=\@@other \catcode`\?=\@@other \catcode`\@=\@@other + \catcode`\#=\@@other \catcode`\&=\@@other \catcode`\|=\@@other + \catcode`\$=\@@other \catcode`\^=\@@other \catcode`\_=\@@other + \catcode`\*=\@@other \catcode`\/=\@@other + \catcode`\-=\@@other \catcode`+=\@@other + \catcode`\==\@@other \catcode`\<=\@@other \catcode`\>=\@@other + \catcode`\"=\@@other \catcode`\'=\@@other \catcode`\`=\@@other + \catcode`\:=\@@other \catcode`\;=\@@other + \catcode`\,=\@@other \catcode`\.=\@@other \catcode`\~=\@@other + \catcode`\(=\@@other \catcode`\)=\@@other + \catcode`\{=\@@other \catcode`\}=\@@other} + +\fi + +%D \macros +%D {doglobal} +%D +%D Some \CONTEXT\ low level macros can have a \type{\doglobal} +%D prefix. Let's just forget about that here: + +\ifnocontextobject \doglobal \do \let\doglobal=\relax \fi + +%D The next obscure one is needed in the generic verbatim +%D environment. When we end up with more of these, it's time +%D to load the module \type{syst-gen}. + +\ifnocontextobject \doifincsnameelse \do + + \def\dodoifincsnameelse#1#2% + {\def\dododoifincsnameelse##1#1##2##3\war% + {\csname\if##2@iffalse\else iftrue\fi\endcsname}% + \expandafter\dododoifincsnameelse#2#1@@\war} + + \long\def\doifincsnameelse#1#2#3#4% + {\edef\@@instring{#1}% + \expandafter\dodoifincsnameelse\expandafter{\@@instring}{#2}% + #3% + \else + #4% + \fi} + +\fi + +%D \macros +%D {dostepwiserecurse} +%D +%D The next loop macro is a real weak one, and does not offer +%D the full \CONTEXT\ functionality, let alone nesting, but +%D for simple purposes, its behaviour is acceptable. + +\newcount\recursecounter + +\def\dostepwiserecurse#1#2#3#4% very weak and rubishly version + {\ifnum#2<#1\relax\else\dodostepwiserecurse{#1}{#2}{#3}{#4}\fi} + +\def\dodostepwiserecurse#1#2#3#4% very weak and rubishly version + {\recursecounter=#1\relax + \loop + \edef\recurselevel{\the\recursecounter}% + #4\relax + \ifnum\recursecounter<#2\relax + \advance\recursecounter by #3\relax + \repeat} + +%D \macros +%D {twodigitrounding} +%D +%D We don't support rounding outside \CONTEXT. Sorry. + +\def\twodigitrounding#1{#1} + +%D That's it. Please forget this junk and take a look at how +%D it should be done. + +\protect + +\endinput |