From: Hans Hagen <j.hagen@xs4all.nl>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>,
"Jairo A. del Rio" <jairoadelrio6@gmail.com>
Subject: Re: Issue with \handletokens\with and Lua-defined macros
Date: Mon, 29 Mar 2021 19:16:27 +0200 [thread overview]
Message-ID: <1cd01bc2-741d-1283-5692-4d8dde12f1d5@xs4all.nl> (raw)
In-Reply-To: <CAKyqqaaosU74HZtOpbUVPeUXhAXRrQzdXknze6GACTpsXk2vsg@mail.gmail.com>
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
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prev parent reply other threads:[~2021-03-29 17:16 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-29 8:54 Jairo A. del Rio
2021-03-29 17:16 ` Hans Hagen [this message]
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