Contents

module Taza
  class Page
    class << self
      attr_accessor :filters, :elements
    end

    self.filters = Hash.new { [] }
    self.elements = {}

    def self.element(name,&block)
      self.elements[name] = block
    end

    def self.filter(params,&block)
      params[:elements] = [:all] unless params.has_key? :elements

      params[:elements].each do |element|
        self.filters[element] = self.filters[element] << [params[:name],block]
      end
    end

    def initialize
      add_element_methods
    end

    def add_element_methods
      self.class.elements.each do |element_name,element_block|
        filters = self.class.filters[element_name] + self.class.filters[:all]
        add_element_method(:filters => filters, :method_name => element_name, :method_block => element_block)
      end
    end

    def add_element_method(params)
      self.class.class_eval do
        define_method(params[:method_name]) do
          params[:filters].each do |(filter_name,filter_block)|
            unless filter_block.call
              raise FilterError, "#{filter_name} returned false for #{params[:method_name]}"
            end
          end
          params[:method_block].call
        end
      end
    end
  end

  class FilterError < StandardError; end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
taza-0.5.0	lib/taza/page.rb