> I myself tend to use named captures nested in table captures only for
> very simple tasks. For anything more complex I prefer to use unamed
> captures nested in function captures: The function then creates the
> table with the proper fields.
More specifically: I tend to use named captures nested in table captures
when there is already a table capture for a list of unamed captures
and I want to add one or two extra named fields in the table (e.g., a
tag). When the table being created is a record, I prefer to use a function.
Hi Roberto,
can you show some examples? I'm still struggling to understand unnamed
group captures...
By the way, I found a solution to the problem in the beginning of this
thread... it is in the last line here:
require "lpeg"
B,C,P,R,S,V = lpeg.B,lpeg.C,lpeg.P,lpeg.R,lpeg.S,lpeg.V
Cb,Cc,Cf,Cg = lpeg.Cb,lpeg.Cc,lpeg.Cf,lpeg.Cg
Cp,Cs,Ct = lpeg.Cp,lpeg.Cs,lpeg.Ct
Carg,Cmt = lpeg.Carg,lpeg.Cmt
lpeg.pm = function (pat, str) PP(pat:match(str or "")) end
lpeg.Cfromthere = function (pat)
return pat:Cmt(function(subj,pos,there)
return pos,subj:sub(there,pos-1)
end)
end
c0 = Cp():Cg"c" -- stores this position in c
ab = C(1):Cg"a" * C(1):Cg"b" -- stores things in a and b
c1 = Cb"c":Cfromthere():Cg"c" -- replaces c by everything from there to here
ab:C():Cg"c" :Ct():pm "ABCD" --> bad: {"c"="AB"}
(c0 * ab * c1):Ct():pm "ABCD" --> good: {"a"="A", "b"="B", "c"="AB"}
Thanks in advance,
Eduardo Ochs
http://anggtwu.net/luaforth.html
