From: Hans van der Meer <H.vanderMeer@uva.nl>
To: NTG ConTeXt <ntg-context@ntg.nl>
Subject: why nil argument
Date: Sun, 14 Nov 2010 18:55:20 +0100 [thread overview]
Message-ID: <2770E777-778C-49BC-86EF-52A65444E21C@uva.nl> (raw)
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:
! LuaTeX error <main ctx instance>:1: bad argument #1 to 'match' (string expected, got nil)
stack traceback:
[C]: in function 'match'
<main ctx instance>:1: in main chunk.
It is no problem if the function returns the string "nil" from tostring() but an error like this I would like to avoid.
Hans van der Meer
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next reply other threads:[~2010-11-14 17:55 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-14 17:55 Hans van der Meer [this message]
2010-11-14 19:27 ` Khaled Hosny
2010-11-14 19:47 ` Hans van der Meer
2010-11-14 19:53 ` Khaled Hosny
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