Gerben Wierda schrieb am 06.04.2020 um 00:41:
I got this error after I had changed some lua code:
tex error > tex error on line 272 in file archimate-lua.new: !
Undefined control sequence
warnIfVerbose( "Breaking off the processing of node %s\nNo
l...eak
xsi:type", node)
\luat_start_lua_code_indeed ...ormalexpanded {\endgroup \noexpand
\directlua {#1
}}
l.272 \stopluacode
<empty file>
The control sequence at the end of the top line of your error message
was never
\def'ed. You can just continue as I'll forget about whatever was undefined.
I have been looking at that code for over two hours, not seeing anything
wrong with it. But I’ve now finally found the culprit and I still do not
get it.
The culprit was:
warnIfVerbose( "Breaking off the processing of %s\n No
elementRef", node)
The problem goes away when I use:
warnIfVerbose( "Breaking off the processing of %s\nNo
elementRef", node)
(I don’t want the line after the node is printed to begin with a space).
But the lack of space between \n and N kills lua (apparently). For
completeness (as string.format and texio.write_nl are also in play):
function warnWithLabelIfVerbose( str, ... )
if verboseProgram then
texio.write_nl( str .. string.format(...))
end
end
function warnIfVerbose( ... )
warnWithLabelIfVerbose("-----> ", ...)
end
Is this a lua bug? A ConTeXt bug? Expected behaviour? And if so, why is
reported that on line 272 (where \stopluacode is) is the error? Or is
the error message indeed helpful and do I just lack the know how to
interpret it?
ConTeXt expands TeX commands in a luacode-environment
and when you have \n followed by text you create a new
command with starts with \n but since it isn't defined
you get a error message.
In the example below the commented block produces
the same error message as you get.
\starttext
%\startluacode
%print("text\ntext")
%\stopluacode
\startluacode
print("text\n text")
\stopluacode
\stoptext
Wolfgang
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