pixelate/raev

module Raev
  
  class Article  

    REGEX_NODE_EMPTY = /\A *\z/

    attr_reader :body
    attr_reader :doc
    
    def initialize(body)
      @doc = Nokogiri::HTML::DocumentFragment.parse(
        replace_non_breaking_space(body)
      )
      
      replace_divs_with_paragraphs(@doc)
      remove_empty_paragraphs(@doc)
      remove_extra_linebreaks(@doc)

      @body = @doc.to_s.gsub("\n".freeze, "".freeze)
    end

    private
    
    def replace_non_breaking_space(str)
      str.gsub(" ".freeze, " ".freeze)
    end
    
    def replace_divs_with_paragraphs(doc)
      doc.css("div".freeze).each do |node|
        if node.css("p".freeze).length == 0        
          node.name = "p".freeze
        end
      end
    end
    
    def remove_empty_paragraphs(doc)
      doc.css("p".freeze).each do |node|
        if node_empty?(node)
          node.remove
        end
      end
    end
    
    def remove_extra_linebreaks(doc)
      doc.css("br".freeze).each do |node|
        next_node = node.next
        
        if next_node
          if next_node.matches?("br".freeze) || node_empty?(next_node)
            node.remove
          end
        else
          node.remove
        end
      end
    end

    def node_empty?(node)
      node.element_children.empty? && REGEX_NODE_EMPTY.match(node.inner_text)
    end

  end

end