* 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
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^ 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
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^ 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
___________________________________________________________________________________
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2010-11-14 19:27 ` Khaled Hosny
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