Method: Traject::MarcExtractor#initialize

Defined in:
lib/traject/marc_extractor.rb

#initialize(spec, options = {}) ⇒ MarcExtractor

First arg is a specification for extraction of data from a MARC record. Specification can be given in two forms:

  • a string specification like "008[35]:020a:245abc", see top of class for examples. A string specification is most typical argument.
  • The output of a previous call to MarcExtractor.parse_string_spec(string_spec), a 'pre-parsed' specification.

Second arg is options:

[:separator] default ' ' (space), what to use to separate subfield values when joining strings

[:alternate_script] default :include, include linked 880s for tags that match spec. Also: * false => do not include. * :only => only include linked 880s, not original



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# File 'lib/traject/marc_extractor.rb', line 127

def initialize(spec, options = {})
  self.options = {
    :separator => ' ',
    :alternate_script => :include
  }.merge(options)

  self.spec_hash = spec.kind_of?(Hash) ? spec : self.class.parse_string_spec(spec)


  # Tags are "interesting" if we have a spec that might cover it
  @interesting_tags_hash = {}

  # By default, interesting tags are those represented by keys in spec_hash.
  # Add them unless we only care about alternate scripts.
  unless options[:alternate_script] == :only
    self.spec_hash.keys.each {|tag| @interesting_tags_hash[tag] = true}
  end

  # If we *are* interested in alternate scripts, add the 880
  if options[:alternate_script] != false
    @interesting_tags_hash['880'] = true
  end

  self.freeze
end