* why nil argument
@ 2010-11-14 17:55 Hans van der Meer
2010-11-14 19:27 ` Khaled Hosny
0 siblings, 1 reply; 4+ messages in thread
From: Hans van der Meer @ 2010-11-14 17:55 UTC (permalink / raw)
To: NTG ConTeXt
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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^ permalink raw reply [flat|nested] 4+ messages in thread* Re: why nil argument 2010-11-14 17:55 why nil argument Hans van der Meer @ 2010-11-14 19:27 ` Khaled Hosny 2010-11-14 19:47 ` Hans van der Meer 0 siblings, 1 reply; 4+ messages in thread From: Khaled Hosny @ 2010-11-14 19:27 UTC (permalink / raw) To: mailing list for ConTeXt users 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") 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 ___________________________________________________________________________________ ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: why nil argument 2010-11-14 19:27 ` Khaled Hosny @ 2010-11-14 19:47 ` Hans van der Meer 2010-11-14 19:53 ` Khaled Hosny 0 siblings, 1 reply; 4+ messages in thread From: Hans van der Meer @ 2010-11-14 19:47 UTC (permalink / raw) To: mailing list for ConTeXt users 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 ___________________________________________________________________________________ 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 ___________________________________________________________________________________ ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: why nil argument 2010-11-14 19:47 ` Hans van der Meer @ 2010-11-14 19:53 ` Khaled Hosny 0 siblings, 0 replies; 4+ messages in thread From: Khaled Hosny @ 2010-11-14 19:53 UTC (permalink / raw) To: mailing list for ConTeXt users 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 ___________________________________________________________________________________ ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2010-11-14 19:53 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2010-11-14 17:55 why nil argument Hans van der Meer 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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