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return function(utf8)
local cl = utf8.regex.compiletime.charclass.builder
local next = utf8.util.next
return function(str, c, bs, ctx)
if not ctx.internal then return end
local nbs = bs
local r1, r2
local c, nbs = c, bs
if c == '%' then
c, nbs = next(str, nbs)
r1 = c
else
r1 = c
end
utf8.debug("range r1", r1, nbs)
c, nbs = next(str, nbs)
if c ~= '-' then return end
c, nbs = next(str, nbs)
if c == '%' then
c, nbs = next(str, nbs)
r2 = c
elseif c ~= '' and c ~= ']' then
r2 = c
end
utf8.debug("range r2", r2, nbs)
if r1 and r2 then
return cl.new():with_ranges{utf8.byte(r1), utf8.byte(r2)}, utf8.next(str, nbs) - bs
else
return
end
end
end
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