Module: Flex::Struct::Prunable

Extended by:
Prunable
Included in:
Prunable
Defined in:
lib/flex/struct/prunable.rb

Defined Under Namespace

Classes: Value

Constant Summary collapse

VALUES = 
[ nil, '', {}, [], false ]

Instance Method Summary collapse

Instance Method Details

#prune(obj, *values) ⇒ Object

prunes the branch when the leaf is Prunable and compact.flatten the Array values values are the prunable values, like VALUES or Prunable::Value, or any arbitrary value



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# File 'lib/flex/struct/prunable.rb', line 24

def prune(obj, *values)
  case
  when values.include?(obj)
    obj
  when obj.is_a?(::Array)
    return obj if obj.empty?
    ar = []
    obj.each do |i|
      pruned = prune(i, *values)
      next if values.include?(pruned)
      ar << pruned
    end
    a = ar.compact.flatten
    a.empty? ? values.first : a
  when obj.is_a?(::Hash)
    return obj if obj.empty?
    h = {}
    obj.each do |k, v|
      pruned = prune(v, *values)
      next if values.include?(pruned)
      # when a key is prunable merges the value if it is a hash (allows merging of partials)
      if VALUES.include?(k)
        h.merge!(pruned) if pruned.is_a?(::Hash)
      else
        h[k] = pruned
      end
    end
    h.empty? ? values.first : h
  else
    obj
  end
end

#prune_blanks(obj) ⇒ Object 



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# File 'lib/flex/struct/prunable.rb', line 16

def prune_blanks(obj)
  prune(obj, *VALUES) || {}
end