lib/rich_text.rb

   1 module RichText
   2   def self.new(format, text)
   3     case format
   4     when "html"; HTML.new(text || "")
   5     when "markdown"; Markdown.new(text || "")
   6     else; nil
   7     end
   8   end
   9
  10   class HTML < String
  11     include ActionView::Helpers::TextHelper
  12     include ActionView::Helpers::TagHelper
  13
  14     def to_html
  15       linkify(sanitize(simple_format(self)))
  16     end
  17
  18     def to_text
  19       self
  20     end
  21
  22   private
  23
  24     def sanitize(text)
  25       Sanitize.clean(text, Sanitize::Config::OSM).html_safe
  26     end
  27
  28     def linkify(text)
  29       if text.html_safe?
  30         Rinku.auto_link(text, :urls, tag_options(:rel => "nofollow")).html_safe
  31       else
  32         Rinku.auto_link(text, :urls, tag_options(:rel => "nofollow"))
  33       end
  34     end
  35   end
  36
  37   class Markdown < String
  38     def to_html
  39       html_parser.render(self).html_safe
  40     end
  41
  42     def to_text
  43       self
  44     end
  45
  46   private
  47
  48     def html_parser
  49       @@html_renderer ||= Redcarpet::Render::XHTML.new({
  50         :filter_html => true, :safe_links_only => true
  51       })
  52       @@html_parser ||= Redcarpet::Markdown.new(@@html_renderer, {
  53         :no_intra_emphasis => true, :autolink => true, :space_after_headers => true
  54       })
  55     end
  56   end
  57 end