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\blackrule[width=\columnA]
</context>
== Defining and accesing dimensions in Lua ==
How to rewrite TeX code
<texcode>
\the\dimexpr\availablehsize\relax %say, 426pt
</texcode>
Mostly LMTX:
<context mode="mkxl" source="yes">
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
</context>
* If you want to calculate, the conversion factors from standard points are stored in {{code|number.dimenfactors}}. For example, {{code|65536 * number.dimenfactors["pt"]}} returns {{code|1}}.
<context source=yes mode=mkiv>
\newdimen\columnA % initialise variable
\columnA=10mm % set variable
