HtmlToPrawn

gistfile1.rb

module HtmlToPrawn
  def self.convert(string)
    tokens = string.scan(/<[^>]+>|[^<>]+/)

    stack = []
    output = ""
    tokens.each do |token|
      case token
      when /<span/
        output << convert_open_span(token, stack)
      when /<\/span/
        output << convert_close_span(stack)
      else
        output << token
      end
    end

    output
  end

  def self.convert_open_span(token, stack)
    if token.include? 'font-size:'
      starting_point  = token.index(":") + 1
      ending_point    = token.index("px") - 1
      font_size       = token[starting_point..ending_point]

      stack << :font

      "<font size='#{font_size}'>"
    elsif token.include? 'color:'
      starting_point  = token.index("#") + 1
      ending_point    = token.index("\">") - 1
      font_color      = token[starting_point..ending_point]

      stack << :color

      "<color rgb='#{font_color.strip}'>"
    else
      stack << :empty

      ""
    end
  end

  def self.convert_close_span(stack)
    tag = stack.pop

    tag != :empty ? "</#{tag}>" : ''
  end
end