class Mail::Parsers::ContentTypeParser

Public Instance Methods

parse(s) click to toggle source
# File lib/mail/parsers/content_type_parser.rb, line 5
def parse(s)
  actions, error = Ragel.parse(:content_type, s)
  if error
    raise Mail::Field::ParseError.new(Mail::ContentTypeElement, s, error)
  end

  content_type = ContentTypeStruct.new(nil,nil,[])

  content_type.parameters = []

  main_type_s = sub_type_s = param_attr_s = param_attr = nil
  qstr_s = qstr = param_val_s = nil
  actions.each_slice(2) do |action_id, p|
    action = Mail::Parsers::Ragel::ACTIONS[action_id]
    case action

    # Main Type
    when :main_type_s then main_type_s = p
    when :main_type_e then
      content_type.main_type = s[main_type_s..(p-1)]
      content_type.main_type.downcase!

    # Sub Type
    when :sub_type_s then sub_type_s = p
    when :sub_type_e
      content_type.sub_type = s[sub_type_s..(p-1)]
      content_type.sub_type.downcase!

    # Parameter Attribute
    when :param_attr_s then param_attr_s = p
    when :param_attr_e then param_attr = s[param_attr_s..(p-1)]

    # Quoted String.
    when :qstr_s then qstr_s = p
    when :qstr_e then qstr = s[qstr_s..(p-1)]

    # Parameter Value
    when :param_val_s then param_val_s = p
    when :param_val_e
      if param_attr.nil?
        raise Mail::Field::ParseError.new(Mail::ContentTypeElement, s, "no attribute for value")
      end

      # Use quoted s value if one exists, otherwise use parameter value
      if qstr
        value = qstr
      else
        value = s[param_val_s..(p-1)]
      end

      content_type.parameters <<  { param_attr => value }
      param_attr = nil
      qstr = nil

    else
      raise Mail::Field::ParseError.new(Mail::ContentTypeElement, s, "Failed to process unknown action: #{action}")
    end
  end
  content_type
end