Module: Siren::Walker

Included in:
JsonParser, Parser
Defined in:
lib/siren/walker.rb

Instance Method Summary collapse

Instance Method Details

#walk(data, &reviver) ⇒ Object

If there is a reviver function, we recursively walk the new structure, passing each name/value pair to the reviver function for possible transformation, starting with a temporary root object that holds the result in an empty key. If there is not a reviver function, we simply return the result.



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# File 'lib/siren/walker.rb', line 9

def walk(data, &reviver)
  data = parse(data) if String === data
  return data unless block_given?
  
  walker = lambda do |holder, key|
    value = holder[key]
    
    for_each = lambda do |k, val|
      v = walker.call(value, k)
      if v.nil?
        holder.delete(k)
      else
        value[k] = v
      end
    end
    
    value.each { |k,v| for_each.call(k,v) } if Hash === value
    value.each_with_index { |v,i| for_each.call(i,v) } if Array === value
    
    reviver.call(holder, key, value)
  end
  
  walker.call({"" => data}, "")
end