module Warning::Processor

def convert_regexp(regexp)

Convert the given Regexp, Symbol, or Array of Symbols into a Regexp.
def convert_regexp(regexp)
  case regexp
  when Regexp
    regexp
  when Symbol
    IGNORE_MAP.fetch(regexp)
  when Array
    Regexp.union(regexp.map{|re| IGNORE_MAP.fetch(re)})
  else
    # nothing
  end
end