On 7/22/2017 3:58 AM, Henri wrote:
On Fri, 2017-07-21 at 11:25 +0000, Jaroslav Hajtmar wrote:
Hello ConTeXist.
Is there any way to evaluate of contents of two macros as I am showing in my
minimal example?
I know, that problem is in expansion, but I dont know to resolve it.
My minimal example consist of piece lua code, because I am solving my problem
in mixed codes (TeX
& Lua)
Something similar has been asked before and it is not possible. The
interfaces.definecommand
function defines a new macro using \protected\def. To compare as equal in a
\doif context, both
operands have to _expand_ to the same thing (here 123). Here \mymacro is not
expandable and thus
only \doifelse{\mymacro}{\mymacro} will ever compare true.
Furthermore, scanning for optional arguments (i.e. [...]) is inherently
non-expandable. To get
something expandable you must at least switch to mandatory arguments (i.e.
{...}). Still, using
interfaces.definecommand will still not be possible. I believe that scanning
arguments is better
done on the macro level than in Lua, but that's just my opinion.
also, it depends on what you want to achieve ... maybe comparing macros
is not needed at all
Thanx for help.
Jaroslav Hajtmar
\starttext
\startluacode
interfaces.definecommand ("domymacro", {
arguments = { { "option", "string" } },
macro = function (opt_1)
if #opt_1>0 then
context(opt_1)
else
context("123")
end
end
})
interfaces.definecommand("mymacro", {
macro = function ()
context.dosingleempty()
context["domymacro"]()
end
})
\stopluacode
there is not that much benefit defining these at the lua end if you
directly feed back into tex anyway
\def\myothermacro{123}
\hairline
\mymacro[123]
\mymacro
\myothermacro
\hairline
\doifelse{\mymacro}{\mymacro[123]}{equal content}{not equal content}
\doifsamestringelse{\mymacro}{\mymacro[123]}{equal content}{not equal content}
\doifinstringelse{\mymacro}{\mymacro[123]}{equal content}{not equal content}
\doifincsnameelse{\mymacro}{\mymacro[123]}{equal content}{not equal content}
\hairline
\doifelse{\mymacro}{\myothermacro}{equal content}{not equal content}
\doifsamestringelse{\mymacro}{\myothermacro}{equal content}{not equal content}
\doifinstringelse{\mymacro}{\myothermacro}{equal content}{not equal content}
\doifincsnameelse{\mymacro}{\myothermacro}{equal content}{not equal content}
\stoptext
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