Thomas A. Schmitz wrote:
>
> You could also use a nice scripting language like ... lua!! lua has
> support for "balanced strings," so no nesting trickery is needed,
> see http://www.lua.org/pil/20.2.html
> (scroll to the bottom of the page). Or you could try and nag Hans
> into giving a nice tutorial on the lua lpeg library at Bohinj! :-)
Even in bare lua, it is very easy to match balanced braces:
local data = "\\footnote{x{y}z}"
local match = "\\footnote%s%b{}"
local i = 0
while true do
i,j = string.find(data, match, i+1)
if i == nil then break end
print(string.sub(data, i, j))
end
with lpeg, the code looks a bit harder, but is still short and
relatively shortforward:
local matchtable = { "TEXT",
SP = lpeg.S" \n\t"^0,
BODY = lpeg.P{ "{" * ((1 - lpeg.S"{}") + lpeg.V(1))^0 * "}" },
FOOTNOTE = lpeg.P"\\footnote" * lpeg.V"SP" * lpeg.V"BODY" / print,
TEXT = (lpeg.V"FOOTNOTE" + 1)^0 * -1,
}
lpeg.match(matchtable, data)
Best wishes,
Taco
___________________________________________________________________________________
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 : https://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
