require "patternmatching"

# Structured data builder 
code = PatternMatching.build {plus(mul(100, 100), 200)}

# Partial style method example
class Calc
  # At first, extends with the module
  extend PatternMatching
  
  # def calcm(o), as 3 partial styles
  func(:calcm).seems as {plus(:x, :y)} do
    calcm(x) + calcm(y)
  end
  func(:calcm).seems as {mul(:x, :y)} do
    calcm(x) * calcm(y)
  end
  func(:calcm).seems as {:value} do
    value
  end
end

# use as standard method
p Calc.new.calcm(code)