Circuits

circuits.rb

#! /usr/bin/env ruby

class Circuit
  def initialize(doc)
    @doc = doc.split("\n").map(&:strip)
    program = create(@doc)
    eval(program.join("\n"))
  end

  def create(doc)
    program = []
    calls = []
    doc.each do |line|
      source, out = line.split('->').map(&:strip)

      if source =~ /AND/
        a, b = source.split('AND').map(&:strip)
        program << "def #{out}; #{a} & #{b}; end"
      elsif source =~ /OR/
        a, b = source.split('OR').map(&:strip)
        program << "def #{out}; #{a} | #{b}; end"
      elsif source =~ /LSHIFT/
        a, b = source.split('LSHIFT').map(&:strip)
        program << "def #{out}; #{a} << #{b}; end"
      elsif source =~ /RSHIFT/
        a, b = source.split('RSHIFT').map(&:strip)
        program << "def #{out}; #{a} >> #{b}; end"
      elsif source =~ /NOT/
        a = source.split('NOT').map(&:strip).last
        program << "def #{out}; 65535-#{a}; end"
      else
        program << "def #{out}; #{source.strip}; end"
      end
      calls << out
    end
    calls = calls.sort.map do |c|
      quoted = '#{' + c + '}'
      %Q(puts "#{c}: #{quoted}")
    end
    program + calls
  end
end

doc =<<-END
  123 -> x
  456 -> y
  x AND y -> d
  x OR y -> e
  x LSHIFT 2 -> f
  y RSHIFT 2 -> g
  NOT x -> h
  NOT y -> i
END

Circuit.new(doc)