gistfile1.rb

module Nokoquery
  module DSL
    module Item

      def item(name, *args, **options, &block)
        modulizer     = Nokoquery::Modulizer.new(module_type: 'Item', name: name, klass: self)
        method_module = modulizer.module_for
        mod_name      = modulizer.module_name

        method_module.class_variable_set(:"@@_#{mod_name}_#{name}_block_capture", block)
        method_module.class_variable_set(:"@@_#{mod_name}_#{name}_options", options)

        line_no = __LINE__; method_defs = %{

          def #{name}
            options = Nokoquery::Options::Item.new(@@_#{mod_name}_#{name}_options)

            node = if #{args}.first || options.selector_specified?
              send(options.selector_type, options.selector { #{args}.first })
            else
              self
            end

            options.before_operations.each { |op| node = op.call(node) }

            node = if @@_#{mod_name}_#{name}_block_capture
              if @@_#{mod_name}_#{name}_block_capture.arity == 1
                @@_#{mod_name}_#{name}_block_capture.call(node)
              else
                node.instance_eval(&@@_#{mod_name}_#{name}_block_capture)
              end
            else
              node
            end

            options.after_operations.each { |op| node = op.call(node) }

            if options.keep?(node)
              node = node.is_a?(Nokogiri::XML::Node) ? Nokoquery::Node.new(node, self, self.options) : node
              block_given? ? (yield node) : node
            else
              nil
            end
          end

        }
        method_module.module_eval method_defs, __FILE__, line_no
      end

    end
  end
end