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From: Hans van der Meer via ntg-context <ntg-context@ntg.nl>
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Subject: parameters TeX->LuaTeX
Date: Sun, 5 Sep 2021 10:14:18 +0200
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There is something I do not understand in the passing of parameters from =
TeX to LuaTex.
This is my TeX definition:
=
\def\ListSort[#1]#2{\directlua{hvdm.listsort([=3D=3D=3D[#2]=3D=3D=3D],[=3D=
=3D=3D[#1]=3D=3D=3D])}}

Calling \ListSort[sep=3D{ + }]{} delivers the string  'sep=3D{ + }' into =
LuaTeX as the printout in the logfile shows and as intended.
However in \ListSort[{ + }]{} the braces have disappeared and =
transferred is nothing more than ' + '.

Why is the transfer messing up the character string I am passing by =
removing the outer braces? Is this a bug or is it an unavoidable =
consequence of the TeX-LuaTeX interface?

dr. Hans van der Meer



--Apple-Mail=_B5025D45-2BA1-408C-812C-C6A6917D3299
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	charset=us-ascii

<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">There=
 is something I do not understand in the passing of parameters from TeX =
to LuaTex.<div class=3D"">This is my TeX definition:</div><div =
class=3D""><div class=3D""><font face=3D"Courier" =
class=3D"">\def\ListSort[#1]#2{\directlua{hvdm.listsort([=3D=3D=3D[#2]=3D=3D=
=3D],[=3D=3D=3D[#1]=3D=3D=3D])}}</font></div><div class=3D""><br =
class=3D""></div><div class=3D"">Calling <font face=3D"Courier" =
class=3D"">\ListSort[sep=3D{ + }]</font>{} delivers the string =
&nbsp;'<font face=3D"Courier" class=3D"">sep=3D{ + }'&nbsp;</font>into =
LuaTeX as the printout in the logfile shows and as intended.</div><div =
class=3D"">However in <font face=3D"Courier" class=3D"">\ListSort[{ + =
}]{}&nbsp;</font>the braces have disappeared and transferred is nothing =
more than '<font face=3D"Courier" class=3D""> + </font>'.</div><div =
class=3D""><br class=3D""></div><div class=3D"">Why is the transfer =
messing up the character string I am passing by removing the outer =
braces? Is this a bug or is it an unavoidable consequence of the =
TeX-LuaTeX interface?</div><div class=3D""><br class=3D""></div><div =
class=3D"">
<div style=3D"color: rgb(0, 0, 0); letter-spacing: normal; text-align: =
start; text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: =
break-word; -webkit-nbsp-mode: space; -webkit-line-break: =
after-white-space;" class=3D""><div style=3D"color: rgb(0, 0, 0); =
font-family: Helvetica; font-style: normal; font-variant-ligatures: =
normal; font-variant-caps: normal; font-variant-east-asian: normal; =
font-variant-position: normal; font-weight: normal; letter-spacing: =
normal; line-height: normal; orphans: 2; text-align: -webkit-auto; =
text-indent: 0px; text-transform: none; white-space: normal; widows: 2; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: =
break-word; -webkit-nbsp-mode: space; -webkit-line-break: =
after-white-space;" class=3D"">dr. Hans van der Meer<br class=3D""><br =
class=3D""></div></div>
</div>

<br class=3D""></div></body></html>=

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