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+%D \module
+%D   [       file=java-ini,
+%D        version=1998.01.30,
+%D          title=\CONTEXT\ JavaScript Macros,
+%D       subtitle=Initialization,
+%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.
+
+\writestatus{loading}{ConTeXt JavaScript Macros / Initialization}
+
+% BUG: preamble zonder used/used en split
+
+% todo: lua sanitizer
+
+% JavaScript support is under development. In the near future
+% a slightly different model will be used. The JScode stuff
+% will probably become just auto function inclusion and the
+% JS_* things will disappear. First I have to find a way to
+% deal with global variables so the 'uses' thing will remain.
+
+% ook p{ref}
+% documentation should be corrected to JS(
+
+% Also, obeylines will be supported.
+
+\unprotect
+
+%D \JAVA\ support is not implemented as a generic support
+%D module. The main reason for this is that passing system
+%D variables to a \JAVASCRIPT\ is closely related to other core
+%D macros.
+
+%D \TEX\ is not the right tool to check the \JAVA\ code; the
+%D most we can do is reporting some passed variables:
+
+\newif\iftraceJScode \traceJScodefalse
+
+\let\traceJScode\traceJScodetrue
+
+%D A bit out of place, but not dangerous:
+
+\bgroup
+\catcode127=\@@letter
+\gdef\delcharacter{^^7f}
+\egroup
+
+%D The number of passed variables is minimalized by setting the
+%D next switch.
+
+\newif\ifminimalizeJScode    \minimalizeJScodetrue
+
+%D \macros
+%D   {JS*}
+%D
+%D Because \JAVASCRIPT's are activated by the user, for
+%D instance by activating on a button, their support is closely
+%D related to the referencing mechanism. Integration takes
+%D place by
+%D
+%D \starttyping
+%D \goto{calculate total}[Sum()]
+%D \stoptyping
+%D
+%D The \type{()} classify this as a script. If they are absent,
+%D the keyword is treated as a normal reference.
+%D
+%D One can pass arguments to such a script by saying:
+%D
+%D \starttyping
+%D \goto{calculate total}[Sum(1.5,2.3)]
+%D \stoptyping
+%D
+%D References are passed by using the \type{R{}} classifier.
+%D
+%D \starttyping
+%D \goto{calculate total}[Sum(1.5,2.3,R{overflow})]
+%D \stoptyping
+%D
+%D The last call calls the script \type{Sum} and passes the
+%D next set of variables:
+%D
+%D \starttyping
+%D JS_S_1="1.5";
+%D JS_S_2="2.3";
+%D JS_R_3="overflow";
+%D JS_P_3=3;
+%D \stoptyping
+%D
+%D The first two parameters are just strings, the third one
+%D however is treated as a reference and results in passing the
+%D reference (if needed this references is prefixed) and the
+%D (real) page number. The alternative:
+%D
+%D \starttyping
+%D \goto{calculate total}[JS(Sum{V{1.5},V{2.3},R{overflow}})]
+%D \stoptyping
+%D
+%D does a verbose passing:
+%D
+%D \starttyping
+%D JS_V_1=1.5;
+%D JS_V_2=2.3;
+%D JS_R_3="overflow";
+%D JS_P_3=3;
+%D \stoptyping
+
+%D We will also support direct function calls. In that case
+%D no intermediate variables are used.
+
+%D \macros
+%D   {startJScode}
+%D
+%D A piece of \JAVASCRIPT\ code is defined by saying:
+%D
+%D \starttyping
+%D \startJScode{SomeScript}
+%D   var Item=this.getField("item");
+%D          N=Item.getArray();
+%D      Total=this.getField("total");
+%D   Total.value=0;
+%D   for (j=0; j<N.length; j++)
+%D     { if (N[j].value!="")
+%D       { Total.value += N[j].value } } ;
+%D   if ((JS_N>0) && (JS_R_1!=""))
+%D     { gotoNamedDest(JS_R_1) };
+%D \stopJScode
+%D \stoptyping
+%D
+%D Such a piece of code is closely related to the interpreter
+%D used. Watch the last two lines, here the script adapts
+%D itself to the presence of a reference.
+%D
+%D While
+%D
+%D \starttyping
+%D \startJScode{name}
+%D   name = 4 ;
+%D \stopJScode
+%D \stoptyping
+%D
+%D assumes uses no preamble or presumes that the preamble is
+%D always loaded, the next definition also tells \CONTEXT\ to
+%D actually include the preamble needed.
+%D
+%D \starttyping
+%D \startJScode{uses} uses {later}
+%D   uses = 6 ;
+%D \stopJScode
+%D \stoptyping
+
+\long\def\startJScode#1 #2
+  {\doifelse{#2}{uses}
+     {\dostartJScodeA{#1}}
+     {\dostartJScodeB{#1} #2 }}
+
+\long\def\dostartJScodeA#1#2 #3\stopJScode
+  {\long\setgvalue{\r!java#1}{\do{#2}{#3}}}
+
+\long\def\dostartJScodeB#1#2\stopJScode
+  {\long\setgvalue{\r!java#1}{\do{}{#2}}}
+
+\let\stopJScode\relax
+
+%D \macros
+%D   {presetJScode}
+%D
+%D The code can be retrieved by saying
+%D
+%D \starttyping
+%D \presetJScode{SomeScript}{template}
+%D \stoptyping
+%D
+%D Such a template is a comma separated list, where
+%D individual entries can optionally be transformed by
+%D \type{R{}} and \type{V{}}.
+%D
+%D After this call, the code is available in \type{\JScode}.
+
+\newif\ifdirectJScode
+
+\def\presetJScode#1#2% #1=operation #2=arguments
+  {\setverbosecscharacters
+   \def\par{\delcharacter}% was: { }
+   \scratchcounter\zerocount
+   \globallet\JScode\empty
+   \def\do##1##2%
+     {\doifelse{##2}{!}\directJScodetrue\directJScodefalse}%
+   \getvalue{\r!java#1}%
+   \edef\!!stringa{#2}%
+   \ifx\!!stringa\empty \else
+     \processcommacommand[\!!stringa]\dopresetJSvariables
+   \fi
+   \def\docommand##1%
+     {\doifundefinedelse{\r!java\r!java##1}
+        {\showmessage\m!javascript2{##1}}
+        {\useJSpreamblenow{##1}}}%
+%        {\doglobal\increment\currentJSpreamble
+%         \doglobal\addtocommalist{##1}\allJSpreambles}}%
+   \def\do##1##2%
+     {\xdef\JScode{\ifdirectJScode#1(\JScode)\else\JScode##2\fi}%
+     %\xdef\JScode{JS\string_N=\the\scratchcounter;\JScode}%
+      \processcommalist[##1]\docommand}%
+   \getvalue{\r!java#1}}
+
+\def\dopresetJSvariables#1%
+  {\advance\scratchcounter \plusone
+   \donefalse
+   \dodopresetJSvariables#1\end}%
+
+\def\dodopresetJSvariables
+  {\doifnextcharelse R\dodopresetJSrefvariables
+  {\doifnextcharelse V\dodopresetJSvervariables
+  {\doifnextcharelse S\dodopresetJSstrvariables
+                      \dodopresetJSrawvariables}}}
+
+\def\dodopresetJSrefvariables R#1\end
+  {\doifreferencefoundelse{#1}
+     {\donetrue \dododopresetJSvariables R{\referenceprefix#1}%
+      \donefalse\dododopresetJSvariables P{\currentrealreference}}
+     {\unknownreference{#1}}%
+   \ifminimalizeJScode \else
+     \donetrue\dododopresetJSvariables S{#1}%
+   \fi}
+
+\def\dodopresetJSvervariables V#1\end
+  {\donefalse\dododopresetJSvariables V{#1}%
+   \ifminimalizeJScode \else
+     \donetrue\dododopresetJSvariables S{#1}%
+   \fi}
+
+\def\dodopresetJSstrvariables S#1\end
+  {\donetrue\dododopresetJSvariables S{#1}}
+
+\def\dodopresetJSrawvariables #1\end
+  {\donetrue\dododopresetJSvariables S{#1}}
+
+\def\JSprefix#1%
+  {JS\string_#1\string_\the\scratchcounter}
+
+\def\dododopresetJSvariables#1#2%
+  {\iftraceJScode
+     \writestatus{JavaScript}{\JSprefix#1=#2}
+     \xdef\JScode{\JScode console.println("\JSprefix#1=#2"); }%
+   \fi
+   \ifdirectJScode
+     \xdef\JScode{\ifx\JScode\empty\else\JScode,\fi\ifdone"#2"\else#2\fi}%
+   \else
+     \xdef\JScode{\JScode\JSprefix#1=\ifdone"#2"\else#2\fi; }%
+   \fi}
+
+%D \macros
+%D   {startJSpreamble, flushJSpreamble}
+%D
+%D One can define insert \JAVASCRIPT\ code at the document level
+%D by using:
+%D
+%D \starttyping
+%D \startJSpreamble{oeps}
+%D   oeps = 1 ;
+%D \stopJSpreamble
+%D \stoptyping
+%D
+%D which is the same as:
+%D
+%D \starttyping
+%D \startJSpreamble{now} used now
+%D   now = 2 ;
+%D \stopJSpreamble
+%D \stoptyping
+%D
+%D while the next definition is only included when actually
+%D used.
+%D
+%D \starttyping
+%D \startJSpreamble{later} used later
+%D   later = 3 ;
+%D \stopJSpreamble
+%D \stoptyping
+%D
+%D This command may be used more that once, but always before
+%D the first page is shipped out.
+
+\newif\ifoneJSpreamble \oneJSpreamblefalse
+
+\let\allJSpreambles\empty
+\newcounter\nofJSpreambles
+\newcounter\currentJSpreamble
+
+\long\def\startJSpreamble#1 #2 %
+  {\bgroup           % we need to restore the catcodes
+   \restoreendofline % just in case it happens while reading lists
+   \doifelse{#2}{used}
+     {\dostartJSpreamble#1 }
+     {\dostartJSpreamble#1 now #2 }}
+
+\long\def\dostartJSpreamble#1 #2 %
+  {\processaction
+     [#2]
+     [     later=>\chardef\JSstatus\zerocount,%
+             now=>\chardef\JSstatus\plusone  ,%
+      \s!default=>\chardef\JSstatus\plustwo  ,%
+      \s!unknown=>\chardef\JSstatus\plustwo  ]%
+    \ifaddJSlinebreaks
+      \obeylines  \let\obeyedline \normalpar
+      \obeyspaces \let\obeyedspace\normalspace
+    \fi
+    \dodostartJSpreamble{#1}}
+
+\long\def\dodostartJSpreamble#1#2\stopJSpreamble
+  {\presetJSfunctions #2function ()\end
+   \long\setgvalue{\r!java\r!java#1}{#2}%
+   \ifcase\JSstatus \else
+     \useJSpreamblenow{#1}%
+   \fi
+   \egroup}
+
+%D \macros
+%D   {setJSpreamble, addtoJSpreamble}
+%D
+%D In addition to the previous preamble definitions, we can
+%D set a preamble \quote {in||line} and add tokens to a
+%D preamble.
+
+\def\setJSpreamble#1#2%
+  {\doifundefined{\r!java\r!java#1}
+     {\setgvalue{\r!java\r!java#1}{#2;}%
+      \doglobal\increment\currentJSpreamble
+      \doglobal\addtocommalist{#1}\allJSpreambles}}
+
+\def\addtoJSpreamble#1#2%
+  {\doifdefinedelse{\r!java\r!java#1}
+     {\edef\!!stringa{\r!java\r!java#1}%
+      \edef\!!stringb{\csname\!!stringa\endcsname}%
+      \@EA\setgvalue\@EA\!!stringa\@EA{\!!stringb #2;}}
+     {\setJSpreamble{#1}{#2}}}
+
+%D \macros
+%D   {useJSpreamblenow}
+%D
+%D The next macro can be used to force inclusion of postponed
+%D \JAVASCRIPT\ preambles.
+
+\def\useJSpreamblenow#1%
+  {\doglobal\increment\currentJSpreamble
+   \doglobal\addtocommalist{#1}\allJSpreambles}
+
+%D Because we want to check for valid calls, we preload the
+%D functions. This means that we can call them directly as
+%D well as indirectly when defined by \type {\startJScode} etc.
+
+% \long\def\presetJSfunctions#1function #2(#3)%
+%   {\doifelsenothing{#2}
+%      {\long\def\presetJSfunctions##1\end{}}
+%      {\stripspaces\from#2\to\ascii
+%       \doifundefined{\r!java\ascii}{\setgvalue{\r!java\ascii}{\do{}{!}}}}%
+%    \presetJSfunctions}
+
+\long\def\presetJSfunctions#1function#2(#3)%
+  {\doifelse{#2}\space
+     {\long\def\presetJSfunctions##1\end{}}
+     {\stripspaces\from#2\to\ascii
+      \doifundefined{\r!java\ascii}{\setgvalue{\r!java\ascii}{\do{}{!}}}}%
+   \presetJSfunctions}
+
+\def\getJSpreamble#1%
+  {\getvalue{\r!java\r!java#1}}
+
+\def\presetJSpreamble
+  {\ifx\allJSpreambles\empty\else
+     \bgroup
+     \setverbosecscharacters
+     \obeyspaces \let\obeyedspace\normalspace
+     \def\par{\delcharacter}% was: { }
+     \globallet\JSpreamble\empty
+     \def\@@collectedJSpreamble{\r!java\r!java collected}%
+     \letvalue{\@@collectedJSpreamble}=\empty
+     \def\docommand##1%
+       {\xdef\JScode{\getvalue{\r!java\r!java##1}}%
+        \ifoneJSpreamble % \global\letcdcsname
+          \@EA\setxvalue\@EA\@@collectedJSpreamble\@EA
+            {\csname\@@collectedJSpreamble\endcsname\JScode}%
+        \else
+          \setxvalue{\r!java\r!java##1}{\JScode}%
+        \fi}%
+     \processcommacommand[\allJSpreambles]\docommand
+     \ifoneJSpreamble
+       \gdef\allJSpreambles{collected}%
+     \fi
+     \globallet\presetJSpreamble\relax
+     \egroup
+   \fi}
+
+\def\flushJSpreamble
+  {\iflocation\ifx\allJSpreambles\empty\else
+     \ifcase\nofJSpreambles\else\ifnum\nofJSpreambles=\currentJSpreamble
+       \bgroup
+       \presetJSpreamble
+       \expanded{\doflushJSpreamble{\allJSpreambles}}%
+       \globallet\flushJSpreamble\relax
+       \globallet\allJSpreambles\empty
+       \egroup
+     \fi\fi
+   \fi\fi}
+
+\def\finalflushJSpreamble
+  {\iflocation
+     \flushJSpreamble
+     \ifcase\currentJSpreamble\relax\else
+       \savecurrentvalue\nofJSpreambles\currentJSpreamble
+       \globallet\currentJSpreamble\nofJSpreambles
+     \fi
+   \fi}
+
+\prependtoks \flushJSpreamble      \to \everyshipout
+\prependtoks \finalflushJSpreamble \to \everylastshipout
+
+%D \macros
+%D   {doPSsanitizeJScode}
+%D
+%D Before the code can be passed to the (\POSTSCRIPT\ or \PDF)
+%D output file, some precautions must be made concerning the
+%D use of \type{(} and~\type{)}. Here we use a beautiful
+%D \type{\aftergroup} trick I discovered in the \TABLE\ format.
+
+\def\doPSsanitizeJScode#1\to#2%
+  {\begingroup
+   \scratchcounter\zerocount % \aftergroup counter
+   \aftergroup\xdef
+   \aftergroup#2%
+   \aftergroup{%
+   \expanded{\defconvertedargument\noexpand\JScode{#1}}%
+   \expandafter\handletokens\JScode\with\dodoPSsanitizeJScode
+   \aftergroup}%
+   \endgroup
+   \iftraceJScode
+     \writestatus{JS trace}{#2}%
+   \fi}
+
+%D I started with:
+%D
+%D \starttyping
+%D \def\dodoPSsanitizeJScode#1%
+%D   {\aftergroup\string
+%D    \if#1(%
+%D      \expandafter\aftergroup\csname#1\endcsname
+%D    \else\if#1)%
+%D      \expandafter\aftergroup\csname#1\endcsname
+%D    \else\if#1;%
+%D      \aftergroup;\aftergroup\string\expandafter\aftergroup\
+%D    \else
+%D      \expandafter\aftergroup#1%
+%D    \fi\fi\fi
+%D    \advance\scratchcounter by 1
+%D    \ifnum\scratchcounter=500
+%D      \expandafter\dododoPSsanitizeJScode
+%D    \fi}
+%D \stoptyping
+%D
+%D For pretty printing purposes, we need some way to signal
+%D \TEX\ macros. Therefore we introduce a special keyword
+%D \type{TEX}. When followed by a space, this keyword is
+%D ignored, that is, filtered from the stream. Now we have:
+
+\chardef\JSisTEX  \zerocount
+\chardef\JScomment\zerocount
+
+\newif\ifaddJSlinebreaks \addJSlinebreakstrue
+
+\def\flushJSisTEX
+  {\ifcase\JSisTEX
+   \or \aftergroup T%
+   \or \aftergroup T\aftergroup E%
+   \or \aftergroup T\aftergroup E\aftergroup X%
+   \fi
+   \chardef\JSisTEX\zerocount}
+
+% \def\doJSlinebreak
+%  {\ifaddJSlinebreaks
+%     \aftergroup\string\aftergroup\n%
+%   \fi}
+%
+% \def\dodoPSsanitizeJScode#1%  % input stack>500 & TEX check
+%   {\if#1/%
+%      \ifnum\JScomment=0
+%        \chardef\JScomment\plusone
+%      \else\ifnum\JScomment=1
+%        \chardef\JScomment\plustwo
+%      \fi\fi
+%    \else
+%      \ifnum\JScomment=1
+%        \aftergroup/%
+%        \chardef\JScomment\zerocount
+%      \fi
+%      \ifnum\JScomment=2
+%        \if#1\delcharacter
+%          \chardef\JScomment\zerocount
+%        \fi
+%      \else
+%        \if#1\delcharacter
+%          \flushJSisTEX\doJSlinebreak
+%        \else\if#1(%
+%          \flushJSisTEX\aftergroup\string\expandafter\aftergroup\csname#1\endcsname
+%        \else\if#1)%
+%          \flushJSisTEX\aftergroup\string\expandafter\aftergroup\csname#1\endcsname
+%        \else\if#1;%
+%          \flushJSisTEX\aftergroup;\doJSlinebreak
+%        \else\if#1T%
+%          \ifnum\JSisTEX=0 \chardef\JSisTEX\plusone   \else\flushJSisTEX\aftergroup T\fi
+%        \else\if#1E%
+%          \ifnum\JSisTEX=1 \chardef\JSisTEX\plustwo   \else\flushJSisTEX\aftergroup E\fi
+%        \else\if#1X%
+%          \ifnum\JSisTEX=2 \chardef\JSisTEX\plusthree \else\flushJSisTEX\aftergroup X\fi
+%        \else\if#1\normalspace
+%          \ifnum\JSisTEX=3 \chardef\JSisTEX\zerocount \else\flushJSisTEX\aftergroup#1\fi
+%        \else
+%          \flushJSisTEX\aftergroup\string\expandafter\aftergroup#1%
+%        \fi\fi\fi\fi\fi\fi\fi\fi
+%      \fi
+%    \fi
+%    \dododoPSsanitizeJScode}
+
+% todo: "http:\\" -> simple. maar wel \" afvangen
+%
+% use new pdftex escape mechanism or make fully expandable version, not used that often btw
+
+\chardef\JSstring\zerocount
+
+\def\doJSlinebreak
+ {\chardef\JScomment\zerocount
+  \chardef\JSstring\zerocount
+  \ifaddJSlinebreaks
+    \aftergroup\string\aftergroup\n%
+  \fi}
+
+\def\dodoPSsanitizeJScode#1%  % input stack>500 & TEX check
+  {\if#1/%
+     \ifnum\JSstring=0
+       \ifnum\JScomment=0
+         \chardef\JScomment\plusone
+       \else\ifnum\JScomment=1
+         \chardef\JScomment\plustwo
+       \fi\fi
+     \else
+       \aftergroup/%
+     \fi
+   \else
+     \ifnum\JScomment=1
+       \aftergroup/%
+       \chardef\JScomment\zerocount
+     \fi
+     % is the delchar trick still needed?
+     \ifnum\JScomment=2
+       \ifnum`#1=13 % brrr
+         \doJSlinebreak
+       \else\if#1\par
+         \doJSlinebreak
+       \else\if#1\delcharacter
+         \doJSlinebreak
+       \fi\fi\fi
+     \else
+       \ifnum`#1=13 % brrr
+         \flushJSisTEX\doJSlinebreak
+       \else\if#1\par
+         \flushJSisTEX\doJSlinebreak
+       \else\if#1\delcharacter
+         \flushJSisTEX\doJSlinebreak
+       \else\if#1(%
+         \flushJSisTEX\aftergroup\string\expandafter\aftergroup\csname#1\endcsname
+       \else\if#1)%
+         \flushJSisTEX\aftergroup\string\expandafter\aftergroup\csname#1\endcsname
+       %\else\if#1;%
+       %  \flushJSisTEX\aftergroup;\doJSlinebreak
+       \else\if#1T%
+         \ifnum\JSisTEX=0 \chardef\JSisTEX\plusone   \else\flushJSisTEX\aftergroup T\fi
+       \else\if#1E%
+         \ifnum\JSisTEX=1 \chardef\JSisTEX\plustwo   \else\flushJSisTEX\aftergroup E\fi
+       \else\if#1X%
+         \ifnum\JSisTEX=2 \chardef\JSisTEX\plusthree \else\flushJSisTEX\aftergroup X\fi
+       \else\if#1\normalspace
+         \ifnum\JSisTEX=3 \chardef\JSisTEX\zerocount \else\flushJSisTEX\aftergroup#1\fi
+       \else
+          % todo: "test\"test"
+         \if#1"%
+           \ifcase\JSstring
+             \chardef\JSstring\plusone
+           \else
+             \chardef\JSstring\zerocount
+           \fi
+         \fi
+         \flushJSisTEX\aftergroup\string\expandafter\aftergroup#1%
+       \fi\fi\fi\fi\fi\fi\fi\fi\fi % \fi
+     \fi
+   \fi
+   \dododoPSsanitizeJScode}
+
+%D Close reading learns that one line comments (\type{// ...})
+%D are removed from the stream. This permits switching in
+%D pretty printing \JAVASCRIPT\ sources as well as saves
+%D some bytes.
+
+%D The magic 500 in the next hack prevents the input stack from
+%D overflowing when large scripts are sanitized.
+
+\def\dododoPSsanitizeJScode
+  {\ifcase\JSisTEX\ifcase\JScomment
+     \advance\scratchcounter \plusone
+   \fi\fi
+   \ifnum\scratchcounter=500
+     \expandafter\dodododoPSsanitizeJScode
+   \fi}
+
+\def\dodododoPSsanitizeJScode
+  {\let\next={%
+   \aftergroup}%
+   \endgroup
+   \begingroup
+   \aftergroup\xdef
+   \aftergroup\sanitizedJScode
+   \aftergroup{%
+   \aftergroup\sanitizedJScode
+   \let\next=}}
+
+%D The macro \type{\doPSsanitizeJScode} converts its argument
+%D into the macro \type{\sanitizedJScode}, thereby prefixing
+%D each \type{(} and \type{)} by a slash.
+
+%D Hooking this mechanism into the general \CONTEXT\ reference
+%D mechanism does not take much effort:
+
+\definespecialtest{JS}%
+  {\doifdefinedelse{\r!java\currentreferenceoperation}}
+
+\definespeciallocation{JS}#1#2%
+  {\iflocation
+     \bgroup
+       \bgroup
+         \presetJScode
+           \currentreferenceoperation
+           \currentreferencearguments
+       \egroup
+       \dohandlegoto
+         {#2}%
+         {\dostartgotoJS\buttonwidth\buttonheight\JScode}%
+         {\dostopgotoJS}%
+     \egroup
+   \else
+     {#2}%
+   \fi}
+
+%D \macros
+%D   {useJSscripts}
+%D
+%D In due time, users will build their collections of scripts,
+%D which can be used (loaded) when applicable. Although not all
+%D public, we will provide some general purpose scripts,
+%D collected in files with names like \type{java-...}. One can
+%D load these scripts with \type{\useJSscripts}, like:
+%D
+%D \starttyping
+%D \useJSscripts[fld]
+%D \stoptyping
+%D
+%D The not so complicated implementation of this macro is:
+
+\def\dodouseJSscripts#1%
+  {\doifelse{#1}\v!reset
+     {\let\allJSpreambles\empty}
+     {\doifundefined{\c!file\f!javascriptprefix#1}
+        {\startnointerference
+           \letgvalueempty{\c!file\f!javascriptprefix#1}%
+           \makeshortfilename[\f!javascriptprefix#1]%
+           \startreadingfile
+             \readsysfile{\shortfilename.\mksuffix}
+               {\showmessage\m!javascript1{#1}}
+               {\readsysfile{\shortfilename.tex}
+                  {\showmessage\m!javascript1{#1}}
+                  \donothing}%
+           \stopreadingfile
+         \stopnointerference}}}
+
+\def\douseJSscripts[#1][#2]%
+  {\processcommalist[#1]\dodouseJSscripts
+   \processcommalist[#2]\useJSpreamblenow}
+
+\def\useJSscripts
+  {\dodoubleempty\douseJSscripts}
+
+\protect \endinput