Module: MixedContentParser

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# File 'common/mixed_content_parser.rb', line 5

def self.parse(content, base_uri, opts = {} )
  opts[:pretty_print] ||= false

  content.strip!
  content.chomp!

  # create an empty document just to get an outputSettings object
  # (seems like the API falls down when we do this directly...)
  d = org.jsoup.Jsoup.parse("")
  d.outputSettings.prettyPrint(opts[:pretty_print])

  # transform blocks of text seperated by line breaks into <p> wrapped blocks
  content = content.split("\n\n").inject("") { |c,n| c << "<p>#{n}</p>"  } if opts[:wrap_blocks]

  cleaned_content = org.jsoup.Jsoup.clean(content, base_uri, org.jsoup.safety.Whitelist.relaxed.addTags("emph", "lb").addAttributes("emph", "render"), d.outputSettings())

  document = org.jsoup.Jsoup.parse(cleaned_content, base_uri, org.jsoup.parser.Parser.xmlParser())
  document.outputSettings.escapeMode(Java::OrgJsoupNodes::Entities::EscapeMode.xhtml)
  document.outputSettings.prettyPrint(opts[:pretty_print])

  # replace lb with br
  document.select("lb").tagName("br")

  # tweak the emph tags
  [ "emph", "title", "unitdate"  ].each do |tag| 
    document.select(tag).each do | emph |
      # make all emph's a span
      emph.tagName("span")

      # <emph> should render as <em> if there is no @render attribute. If there is, render as follows:
      if emph.attr("render").empty?
        emph.attr("class", "emph render-none")

      # render="nonproport": <code>
      elsif emph.attr("render") === "nonproport"
        emph.attr("class", "emph render-#{emph.attr("render")}")
        emph.tagName("code")
        emph.removeAttr("render")

      # set a class so CSS can style based on the render value
      else
        emph.attr("class", "emph render-#{emph.attr("render")}")
        emph.removeAttr("render")
      end
    end
  end
  document.toString()
end