W3C validator for css and html

gistfile1.rb

require 'rest_client'
require 'nori'

Nori.configure do |config|
  config.strip_namespaces = true
  config.convert_tags_to { |tag| tag.snakecase.to_sym }
end

module W3C

  class Base

    class << self
      attr_accessor :base_uri, :file_field
    end

    def self.check(file)
      # make sure we have a File instance
      file = File.new(file) if file.kind_of? String

      resp = RestClient.post base_uri, file_field => file, output: 'soap12'

      file.close

      to_errors Nori.parse(resp)[:envelope][:body]
    end

    private

    def self.to_errors(hash)
      raise NotImplementedError
    end

  end

  class HTML < Base

    self.base_uri = "validator.w3.org/check"
    self.file_field = :uploaded_file

    def self.to_errors(hash)
      hash[:markupvalidationresponse][:errors][:errorlist][:error].map do |e|
        Error.new e[:line], e[:message], e[:col]
      end
    end

  end

  class CSS < Base

    self.base_uri = "http://jigsaw.w3.org/css-validator/validator/"
    self.file_field = :file

    def self.to_errors(hash)
      hash[:cssvalidationresponse][:result][:errors][:errorlist][:error].map do |e|
        arr = e[:message].split
        arr.delete ':'
        Error.new e[:line], arr.join(' ')
      end
    end

  end


  class Error

    attr_accessor :line, :message, :column

    def initialize(line, message, column = nil)
      @line, @message, @column = line, message, column
    end

    def to_s
      "#{line_info} => #{message}"
    end

    private

    def line_info
      if column
        "#{line}:#{column}"
      else
        line
      end
    end

  end

end

url = File.expand_path ARGV.first
errors = W3C::HTML.check url

errors.each { |e| puts e }