candidates = []

block.call do |k, *v|

(if Regexp === k

k === key

else

kn = defined?(k.id2name) ? k.id2name : k

default_pattern = nil

klass = nil

q, a = nil

opts.each do |o|

# argument class

if a

default_style = default_style.guess(arg = a)

default_pattern, conv = search(:atype, o) unless default_pattern

end

sdesc << "-#{q}"

short << Regexp.new(q)

default_pattern, conv = search(:atype, default_style.pattern) unless default_pattern

if !(short.empty? and long.empty?)

s = (style || default_style).new(pattern || default_pattern,

conv, sdesc, ldesc, arg, desc, block)

elsif !block