Ecmabara - A foolish attempt to reimplement capybara-webkit in pure js

ecmabara.rb

module Ecmabara

  def self.included(base_class)
    base_class.class_eval do
      def self.new
        super.extend Page
      end
    end
  end

  module Page
    def page
      @page ||= JsPage.new(super)
    end
  end

  class JsPage
    attr_reader :page, :scopes

    delegate :set_rack_session, :visit, :evaluate_script, :execute_script, to: :page
    delegate :allow_url, :block_unknown_urls, to: :og_driver

    def initialize(page)
      @page = page
      @scopes = []
    end

    def driver
      self
    end

    def og_driver
      page.driver
    end

    def click_on(selector)
      page.execute_script(%Q($(#{scoped_selector(selector)}).trigger('click')))
    # rescue
    #   page.execute_script(%Q($('#{jquery_selector} a:contains(#{selector})').trigger('click')))
    end

    def within(selector, &block)
      scopes << selector
      yield
      scopes.pop
    end

    def find(selector)
      JsNode.new(selector, self)
    end

    def inspect
      to_s
    end

    def to_s
      page.body.to_s
    end

    def scoped_selector(selector)
      s = self.scopes.join(" ")
      s << " "
      s << selector
      return %Q($('#{s}'))      
    end
  end

  class JsNode
    attr_reader :selector, :page

    def initialize(selector, page)
      @selector = selector
      @page = page
    end

    def to_s
      page.evaluate_script(%Q(#{scoped_selector}.html();))
    end

    def inspect
      to_s
    end

    def [](key)
      page.evaluate_script(%Q(#{scoped_selector}.prop('#{key}');))      
    end

    def text
      page.evaluate_script(%Q(#{scoped_selector}.html()))
    end

    def scoped_selector
      s = page.scopes.join(" ")
      s << " "
      s << selector
      return %Q($('#{s}'))
    end
  end
end