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.
Secondly, the call originates from
\startxmlsetups xml:case:burned
\xmldoifelsetext{#1}{}{\FormatDate{\xmlflush{#1}}}{\currentdate}
\stopxmlsetups
This does makes it a string already.
Something else must happen here, I guess.
Hans van der Meer
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