class Sexp

def self.for(klass, method = nil, walk_ancestors = false)
  require 'parse_tree'
  sexp = if walk_ancestors and method then
           klass.ancestors.each do |klass|
             sexp = ParseTree.translate klass, method
             break sexp unless sexp == [nil]
           end
         else
           ParseTree.translate klass, method
         end
  Sexp.from_array sexp
end