On 9/19/2014 9:30 AM, Christoph Reller wrote:

Hi,

\installcommandhandler nicely provides (among others) \define<name> and \setup<name> commands. Thus it is easy to provide a key with \setup...[key=value] and to read the value of such a key with \<name>parameter{key}.

My question is: How do I read the value of a key defined with \setup...[key=value] on the lua side? If I use context.<name>parameter("key") then the value of key is printed directly. I want to be able to read that value and use it in lua with something like myvariable = context.?whatfunction?("key")

Here is some example code:

\unprotect

\startluacode function myfun(parameters,content) context("From lua: Parameters: ") context(parameters) context.elemparameter("gkey") -- directly prints the parameter context.par() end \stopluacode

\installnamespace{elem} \installcommandhandler \????elem {elem} \????elem \appendtoks \setuevalue{\currentelem}{\elem_cmd{\currentelem}}% \to \everydefineelem

\unexpanded\def\elem_cmd#environment{% \edef\currentelem{#environment}% \dosingleempty\elem_cmd_parameters}

\def\elem_cmd_parameters[#parameters]#content{% \setupcurrentelem[#parameters] From \TeX\: Parameters: key=\elemparameter{key}, gkey=\elemparameter{gkey}\par

\ctxlua{myfun(\!!bs#parameters\!!es,\!!bs\normalunexpanded{#content}\!!es)} }

\defineelem[base] \setupelem[gkey=gval]

\protect

\starttext

\base[key=val]{Hello}

\stoptext

Thank you for any feedback,

something like this ... keep in mind that there is no grouping in lua % macros=mkvi \unprotect \installnamespace{elem} \installcommandhandler \????elem {elem} \????elem \startluacode userdata.elem = { data = { [""] = { } } } function userdata.elem.define(namespace,parent) print("define",namespace,parent) userdata.elem.data[namespace] = { } if namespace ~= parent then table.setmetatableindex(userdata.elem.data[namespace],userdata.elem.data[parent]) end end function userdata.elem.setup(namespace,key,gkey) print("setup",namespace,key,gkey) userdata.elem.data[namespace].key = key userdata.elem.data[namespace].gkey = gkey end function userdata.myfun(namespace,one,two) context.par() context("elem: one=%s",userdata.elem.data[namespace][one]) context.par() context("elem: two=%s",userdata.elem.data[namespace][two]) context.par() end \stopluacode \appendtoks \setuevalue{\currentelem}{\elem_cmd{\currentelem}}% \ctxlua{userdata.elem.define("\currentelem","\currentelemparent")}% \to \everydefineelem \appendtoks \ctxlua{userdata.elem.setup("\currentelem","\elemparameter{key}","\elemparameter{gkey}")}% \to \everysetupelem \unexpanded\def\elem_cmd#environment% {\edef\currentelem{#environment}% \dosingleempty\elem_cmd_parameters} \def\elem_cmd_parameters[#parameters]#content% {\setupelem[\currentelem][#parameters] From \TeX\: Parameters: key=\elemparameter{key}, gkey=\elemparameter{gkey}\par \ctxlua{userdata.myfun("\currentelem","key","gkey")}} \defineelem[base] \setupelem[gkey=gval] \protect \starttext \base[key=val]{Hello} \stoptext A simpler alternative is: % macros=mkvi \unprotect \installnamespace{elem} \installcommandhandler \????elem {elem} \????elem \startluacode userdata.elem = { data = { } } function userdata.elem.sync(key,gkey) userdata.elem.data.key = key userdata.elem.data.gkey = gkey end function userdata.myfun(one,two) context.par() context("elem: one=%s",userdata.elem.data[one]) context.par() context("elem: two=%s",userdata.elem.data[two]) context.par() end \stopluacode \appendtoks \setuevalue{\currentelem}{\elem_cmd{\currentelem}}% \to \everydefineelem \unexpanded\def\elem_cmd#environment% {\edef\currentelem{#environment}% \dosingleempty\elem_cmd_parameters} \unexpanded\def\elem_sync {\ctxlua{userdata.elem.sync("\elemparameter{key}","\elemparameter{gkey}")}} \def\elem_cmd_parameters[#parameters]#content% {\setupcurrentelem[#parameters] \elem_sync From \TeX\: Parameters: key=\elemparameter{key}, gkey=\elemparameter{gkey}\par \ctxlua{userdata.myfun("key","gkey")}} \defineelem[base] \setupelem[gkey=gval] \protect \starttext \base[key=val]{Hello} \stoptext ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------