On Aug 28, 2008, at 9:45 AM, Hans Hagen wrote: Hans, thanks a lot for your reply. Amazing - the lua code is so simple that even I can understand it! I'm certain to use it later; for the time being, I want to remain compatible for mkii and XeTeX as well.
\startluacode document.mymodule = document.mymodule or { }
function document.mymodule.checkdimen(str) return (str:find("%a%a$") and str) or (str .. "mm") end \stopluacode
\ctxlua{document.mymodule.checkdimen("#1")}
or more fancy:
function document.mymodule.checkdimen(str) if not str:find("%a%a$") then str = str .. "mm" ctx.writestatus("mymodule","you forgot a dimension unit, so I made it up for you: %s",str) end return str end
for mkii you can use \doifdimensionelse (it reminds me to implement that in mkiv)
Hey, I WAS using \doifdimensionelse and \doifnumberelse! :-) And it appears to be working in mkiv as well! I found out the error in my code (it was too complex, and I was overwriting a variable with the same name; it looks like Metapost assigns "sp" as default unit to \MPvar). Problem solved, but it took me half a day... All best Thomas