On 28/05/20, 00:42, cont...@vivaldi.net wrote:
> Hello,
>
> is it possible to check whether a macro exists (or - is it a non-\undefined
> control sequence) with Lua? Suppose:
>
> ----
> \starttext
> \def\MyMacro{Ahoj}
> \def\MyMac#1#2{Something}
>
> \startluacode
> IsDefined = function(ctl_seq)
> print("CS " .. ctl_seq ..
> (tex.IsCS(ctl_seq) -- Or what to come here?
> "is defined" or "is
> unknown") .. ".")
> end
>
> -- So the function should print to the console:
>
> IsDefined("MyMacro") --> "CS MyMacro is defined."
> IsDefined("MyMac") --> "CS MyMac is defined."
> IsDefined("bf") --> "CS bf is defined."
> IsDefined("dummy") --> "CS dummy is unknown."
>
> \stopluacode
> \stoptext
> ----
>
> Is it possible?
Yes, that is what the token library is there for.
\starttext
\def\MyMacro{Ahoj}
\def\MyMac#1#2{Something}
\startluacode
local str = { [true] = "defined", [false] = "undefined" }
for _, macro in ipairs({ "MyMacro", "MyMac", "bf", "dummy" }) do
context(macro .. " is " .. str[token.is_defined(macro)] .. "\\par")
end
\stopluacode
\stoptext
Cheers, Henri
>
> Best regards,
>
> Lukas
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