Re: [NTG-context] lpeg pattern in function

7 Aug 2021

      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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