To be wikified (by me, obviously). Thank you for such a great number of alternatives. Jairo :) El lun, 18 de ene. de 2021 a la(s) 04:45, Hans Hagen (j.hagen@xs4all.nl) escribió:
On 1/18/2021 1:58 AM, Jairo A. del Rio wrote:
Hi, list.
I want to get some dimensions in Lua. See, for instance
\starttext
\the\dimexpr\availablehsize\relax %say, 426pt
\stoptext
Is there an equivalent in ConTeXt for Lua, i.e. without passing values from TeX or, at least, using only Lua commands? Thank you in advance. tex being tex, there is always a way ...
1: \number\dimexpr\availablehsize\relax
2: \startluacode
token.set_macro(tex.ctxcatcodes,"temp","\\scratchdimen\\availablehsize") token.expand_macro("temp") context(tex.getdimen("scratchdimen")) \stopluacode
3: \startluacode
token.set_macro(tex.ctxcatcodes,"temp","\\scratchdimen\\availablehsize") tex.runlocal("temp") context(tex.getdimen("scratchdimen")) \stopluacode
4: \startluacode tex.print("\\scratchdimen\\availablehsize") tex.pushlocal() tex.poplocal() context(tex.getdimen("scratchdimen")) \stopluacode
5: \startluacode tex.print("\\dimensiondef\\temp\\availablehsize") tex.pushlocal() tex.poplocal() context(tex.getdimensionvalue("temp")) \stopluacode
\def\calculateavailablehsize{\dimensiondef\temp\availablehsize}
6: \startluacode token.expand_macro("calculateavailablehsize") context(tex.getdimensionvalue("temp")) \stopluacode
\newtoks\tcalculateavailablehsize \tcalculateavailablehsize{\dimensiondef\temp\availablehsize}
7: \startluacode -- mkiv tex.runtoks("tcalculateavailablehsize") context(tex.getdimensionvalue("temp")) \stopluacode
i'm (still) considering a way to flag a macro to be an expression (or value) but there are several variants possible but normally it takes a while before i decide what makes most sense (as i need to apply it in real code to see if it looks nice)
Hans
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