Method: MARC::XMLWriter.encode

Defined in:
lib/marc/xmlwriter.rb

.encode(record, opts = {}) ⇒ Object

a static method that accepts a MARC::Record object and returns a REXML::Document for the XML serialization.



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# File 'lib/marc/xmlwriter.rb', line 90

def self.encode(record, opts = {})
  single_char = Regexp.new('[\da-z ]{1}')
  subfield_char = Regexp.new('[\dA-Za-z!"#$%&\'()*+,-./:;<=>?{}_^`~\[\]\\\]{1}')
  control_field_tag = Regexp.new("00[1-9A-Za-z]{1}")

  # Right now, this writer handles input from the strict and
  # lenient MARC readers. Because it can get 'loose' MARC in, it
  # attempts to do some cleanup on data values that are not valid
  # MARCXML.

  # TODO? Perhaps the 'loose MARC' checks should be split out
  # into a tolerant MARCXMLWriter allowing the main one to skip
  # this extra work.

  # TODO: At the very least there should be some logging
  # to record our attempts to account for less than perfect MARC.

  e = REXML::Element.new("record")
  e.add_namespace(MARC_NS) if opts[:include_namespace]

  leader_element = REXML::Element.new("leader")
  leader_element.add_text(fix_leader(record.leader))
  e.add_element(leader_element)

  record.each do |field|
    if field.instance_of?(MARC::DataField)
      datafield_elem = REXML::Element.new("datafield")

      ind1 = field.indicator1
      # If marc is leniently parsed, we may have some dirty data; using
      # the 'z' ind1 value should help us locate these later to fix
      ind1 = "z" if ind1.nil? || !ind1.match?(single_char)
      ind2 = field.indicator2
      # If marc is leniently parsed, we may have some dirty data; using
      # the 'z' ind2 value should help us locate these later to fix

      ind2 = "z" if field.indicator2.nil? || !ind2.match?(single_char)

      datafield_elem.add_attributes({
        "tag" => field.tag,
        "ind1" => ind1,
        "ind2" => ind2
      })

      field.subfields.each do |subfield|
        subfield_element = REXML::Element.new("subfield")

        code = subfield.code
        # If marc is leniently parsed, we may have some dirty data; using
        # the blank subfield code should help us locate these later to fix
        code = " " if subfield.code.match(subfield_char).nil?

        subfield_element.add_attribute("code", code)
        text = subfield.value
        subfield_element.add_text(text)
        datafield_elem.add_element(subfield_element)
      end

      e.add_element datafield_elem
    elsif field.instance_of?(MARC::ControlField)
      control_element = REXML::Element.new("controlfield")

      tag = field.tag
      # We need a marker for invalid tag values (we use 000)
      tag = "00z" unless tag.match(control_field_tag) || MARC::ControlField.control_tag?(tag)

      control_element.add_attribute("tag", tag)
      text = field.value
      control_element.add_text(text)
      e.add_element(control_element)
    end
  end

  # return xml
  e
end