Re: [NTG-context] Dig out contents of the TeX macro using Lua
On 7/14/2015 10:41 PM, Jaroslav Hajtmar wrote: Hello ConTeXist. I hope that my crazy questions not much bother. This time I needed to get to the fair value of the parameter, delivering to lua function over the content macros. Obviously it's my misunderstanding of the functioning of expansion in case maker with optional parameters, or you really can not explain the functioning of the transmission values. It seems that is passed to a sort of reference as to the actual contents of the macro perhaps can not even get through Lua. Or did they? The following minimal example, perhaps explain what going on. Tex has tokens so foo is three tokens f o o and not a string. This means that you need to turn tokens into a string (using the (new)token library). It means that you need to be well aware of tex's internals and the way it deals with input - tokenization - expansion etc etc. The question ultimately: Is there any alternative how using Lua somehow easily evaluate the macro content? For example to determine whether two different macros have the same content? just avoid storing stuff in macros .. .as most you do seem to be lua, keep your data in lua. If you put something in a token register you can consult it as string but even then it cannot be what you expect as embedded macros don't get expanded (for good reason as they can be anything). Hans - Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com | www.pragma-pod.nl - ___ 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 ___
[NTG-context] Dig out contents of the TeX macro using Lua
Hello ConTeXist.
I hope that my crazy questions not much bother.
This time I needed to get to the fair value of the parameter, delivering
to lua function over the content macros.
Obviously it's my misunderstanding of the functioning of expansion in
case maker with optional parameters, or you really can not explain the
functioning of the transmission values. It seems that is passed to a
sort of reference as to the actual contents of the macro perhaps can not
even get through Lua. Or did they?
The following minimal example, perhaps explain what going on.
The question ultimately: Is there any alternative how using Lua somehow
easily evaluate the macro content? For example to determine whether two
different macros have the same content?
Jaroslav Hajtmar
here is minimal example:
\starttext
This works as expected:
\def\makrowithcontent{}
\edef\testparameter#1{%
\startluacode
local parameter='#1'
if parameter=='' then context('TRUE. ') else context('FALSE. ') end
context('Parameter '..parameter..' has length '..string.len(parameter))
\stopluacode
}%
\type{\makrowithcontent} -- \makrowithcontent
Test is \testparameter{}
Test is \testparameter{} % OK
Test is \testparameter{\makrowithcontent} % OK
But what about with this: ???
% initialize values
\startluacode
A={}
for i=1,50 do A[i]='Record '..tostring(i) end
A[25]=''
\stopluacode
\def\makrowithcontent{}
\def\lastname{\dosingleempty\dolastname}%
\def\dolastname[#1]{\doifsomethingelse{#1}{\ctxlua{context(A[#1])}}{\makrowithcontent}}%
\type{\lastname} - \lastname
\type{\lastname[2]} - \lastname[2]
\type{\lastname[5]} - \lastname[5]
\type{\lastname[25]} - \lastname[25]
\edef\readandprocessparameters#1#2{%
\startluacode
local parameter1='#1'
if parameter1=='' then context('Test '..parameter1..' = is
TRUE. ') else context('Test '..parameter1..' = is FALSE. ') end
context('Parameter 1 = '..parameter1..' has length
'..string.len(parameter1))
context('\\crlf')
local parameter2='#2'
if parameter2=='' then context('Test '..parameter2..' = is
TRUE. ') else context('Test '..parameter2..' = is FALSE. ') end
context('Parameter 2 = '..parameter2..' has length
'..string.len(parameter2))
context('\\crlf')
\stopluacode
}%
\readandprocessparameters{}{}
%Test is \readandprocessparameters{\lastname[25]}{\lastname} % Crashed
\readandprocessparameters{\\lastname[25]}{\\lastname}
\stoptext
___
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
___
