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
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
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
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
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Hans van der Meer -
Khaled Hosny