Module: BerkeleyLibrary::Marc::FieldInfo::VarFields::Obsolescible

Included in:
IndDef, IndValDef, InstrumentOrVoicesCode, Section, SubfieldDef, SubfieldVal, VarFieldDef, VarFieldList
Defined in:
lib/berkeley_library/marc/field_info/var_fields/obsolescible.rb

Overview

Mixin for possibly-obsolete members of a MARC field info tree

Constant Summary collapse

OBSOLETE =

Description marker for obsolete elements in a MARC field list

'[OBSOLETE]'.freeze

Instance Method Summary collapse

Instance Method Details

#_reject_obsolete(obs) ⇒ Array<Obsolescible> (protected)

Utility method for deep-rejecting obsolete members and their obsolete descendants from a list of Obsolescibles.

Parameters:

Returns:

  • (Array<Obsolescible>) —

    a filtered list with no obsolete nodes, and no non-leaf nodes with only obsolete descendants



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# File 'lib/berkeley_library/marc/field_info/var_fields/obsolescible.rb', line 44

def _reject_obsolete(obs)
  obs.lazy
    .reject(&:obsolete?)
    .map(&:reject_obsoletes)
    .reject(&:empty?)
    .to_a
end

#empty? ⇒ Boolean

Return true if this object's subtree is empty, false if this object is a leaf node or has a non-empty subtree.

Returns:

  • (Boolean) 


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# File 'lib/berkeley_library/marc/field_info/var_fields/obsolescible.rb', line 32

def empty?
  # default implementation for leaf nodes
  false
end

#obsolete? ⇒ Boolean

Return true if this Obsolescible's description marks it as obsolete, false otherwise

Returns:

  • (Boolean) —

    true if obsolete, false otherwise



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# File 'lib/berkeley_library/marc/field_info/var_fields/obsolescible.rb', line 14

def obsolete?
  return unless respond_to?(:desc)

  desc&.include?(OBSOLETE)
end

#reject_obsoletes ⇒ Object

Return a copy of this object with all obsolete nodes in its subtree removed, or the object itself if it has no descendants. Note that in the (pathological) situation of a non-obsolete, non-leaf node with no non-obsolete descendants, an empty object will be returned.



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# File 'lib/berkeley_library/marc/field_info/var_fields/obsolescible.rb', line 25

def reject_obsoletes
  # default implementation for leaf nodes
  self
end