MultidimensionalTable

gistfile1.txt

module MultidimensionalTable

  def initialize
    set_dimensions(dimensions)
    data
  end

  def set_dimensions(map)
    @dimensions = map
    @dimensions.each do |key, value|
      value.each do |possible_value|
        Kernel.class_eval do
        define_method possible_value do |value = nil,  &block|
          if value.nil? && !block.nil?
            @index_level += 1
            @context[@index_level] = "@attributes[:#{key}] == :#{possible_value}" 
            block.call
            @index_level -= 1
          elsif !value.nil?
            context = (1..@index_level).reduce([]) { |context, level| context << @context[level] }
            @table_rules[value] = context << ["@attributes[:#{key}] == :#{possible_value}"]  
          end
        end
        end
      end
    end
  end

  def update_attributes(attrs)
    attrs.each do |key, value| @attributes[key] = value end
  end

  def table_result
    @table_rules.each { |key, condition| return key if eval(condition.join(' && ')) == true }
  end

  def table_data
    @context = []
    @table_rules = {}
    @attributes ||= {}
    @index_level = 0
    yield
  end

  def dimensions
    @dimensions ||= {}
  end

end



class TestClass
  include MultidimensionalTable

  def dimensions
    {
      :test_material => [:test_potassium, :coal, :sugar] ,
      :time_of_day => [:morning, :evening],
      :part_of_world => [:first_world, :third_world]
    }


  end

  def data
    table_data do
      morning do
        first_world do
          coal '8t' 
          sugar '9t' 
        end
      end
    end
  end
end

puts TestClass.new.tap { |test| test.update_attributes(:test_material => :coal, :time_of_day => :morning, :part_of_world => :first_world ) }.table_result
puts TestClass.new.tap { |test| test.update_attributes(:test_material => :sugar, :time_of_day => :morning, :part_of_world => :first_world ) }.table_result

This set_dimension is bothering me in a sense that I keep track of current contex and have to count level on which I am on.