On Sun, Nov 14, 2010 at 08:47:30PM +0100, Hans van der Meer wrote: > > On 14 nov 2010, at 20:27, Khaled Hosny wrote: > > > On Sun, Nov 14, 2010 at 06:55:20PM +0100, Hans van der Meer wrote: > >> In transforming dates through a Lua-call I get a nil error I do not > >> understand. > >> > >> The luatex code = > >> \startluacode > >> hvdm = hvdm or {} > >> require "lpeg" > >> -- Transform date in Lua from yyyymmdd to dd-mm-yyyy with checks > >> hvdm.day = lpeg.R("02") * lpeg.R("09") + lpeg.P("30") + lpeg.P("31") - > >> lpeg.P("00") > >> hvdm.month = lpeg.P("0") * lpeg.R("19") + lpeg.P("10") + lpeg.P("11") + > >> lpeg.P("12") > >> hvdm.year = lpeg.R("12") * lpeg.R("09") * lpeg.R("09") * lpeg.R("09") > >> hvdm.date = lpeg.C(hvdm.year) * lpeg.C(hvdm.month) * lpeg.C(hvdm.day) * > >> -1 / "%3-%2-%1" > >> \stopluacode > >> \def\FormatDate#1{\ctxlua{tex.print(tostring(hvdm.date:match(#1)))}} > >> > >> Calling \FormatDate(1) is OK although it returns "nil" (correct would be > >> #1 = 20101114 > >> Calling \FormatDate(A) is not OK with the error: > > > > You are passing a undefined variable, A. Your argument should be quoted: > > > > hvdm.date:match("#1") > > > > I would think that is not the case. > For one, because then calling with argument 1 would fail in the same manner > as argument A does; which does not happen.
No, match(1) will match an integer 1, match("1") matches a string "1", while match(A) will match a variable A which is not what you are after, while match("A") will match a string "A". > Secondly, the call originates from > \startxmlsetups xml:case:burned > \xmldoifelsetext{#1}{}{\FormatDate{\xmlflush{#1}}}{\currentdate} > \stopxmlsetups > This does makes it a string already. TeX is not lua, the concepts are completely and totally different. > Something else must happen here, I guess. No, there isn't. Regards, Khaled -- Khaled Hosny Arabic localiser and member of Arabeyes.org team Free font developer ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___________________________________________________________________________________