Re: lpeg pattern in function

[Hans Hagen via ntg-context <ntg-context@ntg.nl>]

On 8/6/2021 10:58 PM, Marcus Vinicius Mesquita via ntg-context wrote:
> Dear list,
> in the mwe below, the expected result is ok for most entries but fails 
> when the word contains the letters ó or ô.
> We get zoolco instead of zoológico, and termtro instead of termômetro. 
> What am I doing wrong?
> 
> mwe:
> 
> \def\stripnumber#1%
>          {\cldcontext{lpeg.match(lpeg.stripper("[¹²³⁴⁵⁶⁷⁸⁹⁰]"), 
> [==[#1]==])}}
> 
> \starttext
> 
> \stripnumber{árbitro⁶}
> \stripnumber{ébano¹}
> \stripnumber{ícone⁸}
> \stripnumber{zoológico⁰}
> \stripnumber{eletroacústico⁹}
> \stripnumber{trânsfuga⁷}
> \stripnumber{farmacêutico¹}
> \stripnumber{maître²}
> \stripnumber{termômetro³}
> \stripnumber{noûs⁴}
> 
> \stoptext


\def\stripnumber#1%
   {\cldcontext{lpeg.match(lpeg.stripper(lpeg.US("¹²³⁴⁵⁶⁷⁸⁹⁰")), 
[==[#1]==])}}

(US -> utf set) 	

or

\startluacode
     local s = lpeg.stripper(lpeg.US("¹²³⁴⁵⁶⁷⁸⁹⁰"))
     function document.StripNumber(str)
         context(lpeg.match(s, str))
     end
\stopluacode

\def\stripnumber#1{\ctxlua{document.StripNumber([==[#1]==])}}

or you can go fancy:

\startluacode
     local p_strip = lpeg.stripper(lpeg.US("¹²³⁴⁵⁶⁷⁸⁹⁰"))

     interfaces.implement {
         name      = "StripNumber",
         public    = true,
         arguments = "string",
         actions   = function(str)
             context(lpeg.match(p_strip, str))
         end
     }
\stopluacode

\StripNumber{zoológico⁰}

There are more efficient variants but i guess it's good enough.

Hans

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                                           Hans Hagen | PRAGMA ADE
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