gistfile1.rb

require 'rubygems'
require 'ripper'
require 'sorcerer'
require 'awesome_print'

def ident(name, pos=[0, 0])
  [:@ident, name, pos]
end

def var_ref(name)
  [:var_ref, ident(name)]
end

def binary(arg1, operator, arg2)
  [:binary, arg1, operator, arg2]
end

def defun_sexp(function_name, params, body)
  params_ary = [:params, params.map {|el| ident(el)}, nil, nil, nil, nil]
  [:def, ident(function_name),
     [:paren, params_ary],
     [:bodystmt, [body], nil, nil, nil]
  ]
end

def program(program)
  [:program, [program]]
end

target = <<RUBY
def sum(a,b)
  a + b
end
RUBY

ap Ripper.sexp(target)

puts "########################################################################"
puts "########################################################################"
puts "########################################################################"

binaryop = binary(var_ref('a'), :+ , var_ref('b'))
sexp = program(defun_sexp('sum', ['a', 'b'], binaryop))

ap sexp

puts Sorcerer.source(sexp, multiline: true)
puts Sorcerer.source(Ripper.sexp(target), multiline: true)