pulibrary / bibdata / f04bc944-f9b4-4a42-8b26-dcacd0e3e688

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40.0
/marc_to_solr/lib/hierarchical_heading.rb
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# frozen_string_literal: true
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# Generate hierarchical heading strings










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# like German language—Foreign words and phrases










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class HierarchicalHeading




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  def initialize(field:, spec:, split_on_subfield:)




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    @field = field




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    @spec = spec




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    @split_on_subfield = split_on_subfield




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  end










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  def to_s




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    return unless any_subfields?




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    compile_string




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  end










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  private




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    def any_subfields?




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      subfields.any?




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    end










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    def compile_string




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      heading = Traject::Macros::Marc21.trim_punctuation(first_subfield.value)




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      remaining_subfields.each do |subfield|




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        heading << delimiter_for(subfield)




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        heading << Traject::Macros::Marc21.trim_punctuation(subfield.value)




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      end











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      heading




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    end










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    def delimiter_for(subfield)




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      @split_on_subfield.include?(subfield.code) ? SEPARATOR : ' '




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    end










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    def first_subfield




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      subfields.first




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    end










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    def remaining_subfields




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      subfields.drop(1)




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    end










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    def subfields




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      @subfields ||= @field.subfields.select { |subfield| @spec.subfields.include? subfield.code }




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    end










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end
























    

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