Contents

module MdData
  def self.included(base)
    base.extend MdDataClassMethods
  end

  module MdDataClassMethods  

    def table_data(&block)
      @table_data_block = block
    end

    def select(attributes)
      @rules = []
      @current_context = nil
      load_rules
      container = self.new
      define_helpers_methods(attributes)
      define_dimension_values_methods
      define_select_from_rules
      container.select_from_rules(@rules)
    end

    def dimension(name, allowed_values)
      dimensions[name] = allowed_values
    end

    def dimensions
      @dimensions ||= {}
    end
    

    private
    def load_rules
      @table_data_block.call
    end

    def add(value, condition)
      context_condition = @current_context.nil? ? '' : " && #{@current_context} "
      @rules << ( [value , (condition + context_condition)] )
    end

    def context(condition, &block)
      @current_context = condition
      block.call
    end

    def  define_helpers_methods(attributes)
      attributes.each do |key,value|
        self.send(:define_method, key) do
          value
        end
      end
    end

    def define_dimension_values_methods
      unless @dimensions.nil?
        @dimensions.each do |name, values|
          values.each do |value|
            self.send(:define_method, value) do
              eval "#{name} == :#{value}"
            end
          end
        end
      end
    end

    def define_select_from_rules
      self.send(:define_method, :select_from_rules) do |rules|
        result = nil
        rules.each do |rule|
          rule_is_satisfied = eval(rule[1])
          if rule_is_satisfied
            result = rule[0]
            break
          end
        end
        result
      end
    end

  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
md_data-1.1.0	lib/md_data/md_data.rb