Contents

module Logicle
  class Node
    LOGIC_OPERATIONS = {
      switch: Proc.new { |args| nil },
      bulb:   Proc.new { |args| args[0].state },
      on:     Proc.new { |args| true },
      off:    Proc.new { |args| false },
      not:    Proc.new { |args| !args[0].state },
      and:    Proc.new { |args| args[0].state & args[1].state },
      or:     Proc.new { |args| args[0].state | args[1].state },
      nand:   Proc.new { |args| !args[0].state | !args[1].state },
      nor:    Proc.new { |args| !args[0].state & !args[1].state },
      xor:    Proc.new { |args| args[0].state ^ args[1].state },
      xnor:   Proc.new { |args| !(args[0].state ^ args[1].state) }
    }

    attr_reader   :id, :type, :inputs

    def initialize(id, type)
      @id = id
      @type = validate_type(type)
      @inputs = []
    end

    def bulb?
      @type == :bulb
    end

    def switch?
      @type == :switch
    end

    def type=(new_type)
      @type = validate_type(new_type)
    end

    def append_inputs(*nodes)
      @inputs += nodes
    end
    alias_method :append_input, :append_inputs

    def clear_inputs
      @inputs = []
      @state = nil
    end

    def state
      @state ||= evaluate
    end

    private
    def validate_type(type)
      if LOGIC_OPERATIONS.has_key?(type)
        type
      else
        raise UnknownNodeTypeError, "Unknown node type: '#{ type }'"
      end
    end

    def evaluate
      operation = LOGIC_OPERATIONS[@type]
      operation.call(@inputs)
    end
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
logicle-0.1.1	lib/logicle/node.rb