* Issue with \handletokens\with and Lua-defined macros
@ 2021-03-29 8:54 Jairo A. del Rio
2021-03-29 17:16 ` Hans Hagen
0 siblings, 1 reply; 2+ messages in thread
From: Jairo A. del Rio @ 2021-03-29 8:54 UTC (permalink / raw)
To: mailing list for ConTeXt users
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Hi list! See the following example:
\startluacode
userdata = userdata or {}
--Toy example
--My actual function receives an argument, but the problem remains the same
userdata.myfunction = function()
return
"343327959841638047651959775267761420323" ..
"657838053757849835434002826851807933276" ..
"324327913964298509889902373459201557839" ..
"84828001486412574060553756854137069878601"
end
interfaces.implement{
name = "myfunction",
public = true,
actions =
function ()
context(userdata.myfunction())
end
}
\stopluacode
\def\colorfulnumbers#1{\colored[h=\luaexpr{40*#1},s=1,v=1]{#1}\ }%
\starttext
%It doesn't work
%\handletokens{\myfunction}\with\colorfulnumbers
\expandafter\handletokens\expandafter{\myfunction}\with\colorfulnumbers
\stoptext
As readily seen from my example, I want to color each figure of the numbers
generated by a Lua function. However, the use of \expandafter's is
cumbersome in this case. I don't want to loop over the result in Lua
because I want to be able to apply \handletokens...\with... (or another
macro with a similar purpose) with different macros at the TeX end once Lua
has delivered results. How should I do it in ConTeXt?
Thanks in advance. Cordially,
Jairo
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Issue with \handletokens\with and Lua-defined macros
2021-03-29 8:54 Issue with \handletokens\with and Lua-defined macros Jairo A. del Rio
@ 2021-03-29 17:16 ` Hans Hagen
0 siblings, 0 replies; 2+ messages in thread
From: Hans Hagen @ 2021-03-29 17:16 UTC (permalink / raw)
To: mailing list for ConTeXt users, Jairo A. del Rio
On 3/29/2021 10:54 AM, Jairo A. del Rio wrote:
> Hi list! See the following example:
>
> \startluacode
>
> userdata = userdata or {}
>
>
> --Toy example
>
> --My actual function receives an argument, but the problem remains the same
>
>
> userdata.myfunction = function()
>
> return
>
> "343327959841638047651959775267761420323" ..
>
> "657838053757849835434002826851807933276" ..
>
> "324327913964298509889902373459201557839" ..
>
> "84828001486412574060553756854137069878601"
>
> end
>
>
> interfaces.implement{
>
> name = "myfunction",
>
> public = true,
>
> actions =
>
> function ()
>
> context(userdata.myfunction())
>
> end
>
> }
>
> \stopluacode
>
> \def\colorfulnumbers#1{\colored[h=\luaexpr{40*#1},s=1,v=1]{#1}\ }%
>
> \starttext
>
> %It doesn't work
>
> %\handletokens{\myfunction}\with\colorfulnumbers
>
> \expandafter\handletokens\expandafter{\myfunction}\with\colorfulnumbers
>
> \stoptext
>
>
> As readily seen from my example, I want to color each figure of the
> numbers generated by a Lua function. However, the use of \expandafter's
> is cumbersome in this case. I don't want to loop over the result in Lua
> because I want to be able to apply \handletokens...\with... (or another
> macro with a similar purpose) with different macros at the TeX end once
> Lua has delivered results. How should I do it in ConTeXt?
In the usual way: different from what you might expect:
\startluacode
userdata = userdata or { }
userdata.myfunction = function()
return
"343327959841638047651959775267761420323" ..
"657838053757849835434002826851807933276" ..
"324327913964298509889902373459201557839" ..
"84828001486412574060553756854137069878601"
end
\stopluacode
\doloopovermatch {.} {\luaexpr{userdata.myfunction()}} {%
\colored[h=\luaexpr{40*#1},s=1,v=1]{#1}\space
}
or let youself surprise by:
\startluacode
userdata = userdata or { }
userdata.myfunction = function()
return [[
343327959841638047651959775267761420323
657838053757849835434002826851807933276
324327913964298509889902373459201557839
84828001486412574060553756854137069878601
]]
end
\stopluacode
\starttext
\doloopovermatch {\letterpercent d} {\luaexpr{userdata.myfunction()}} {%
\colored[h=\luaexpr{40*#1},s=1,v=1]{#1}\space
}
(I think it's even documented somewhere.)
\handletokens is kind of mkii-ish and old fashioned.
Hans
-----------------------------------------------------------------
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://context.aanhet.net
archive : https://bitbucket.org/phg/context-mirror/commits/
wiki : http://contextgarden.net
___________________________________________________________________________________
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2021-03-29 17:16 ` Hans Hagen
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