Module: ListSerializer

Defined in:
lib/rubyslim/list_serializer.rb

Class Method Summary collapse

Class Method Details

.length_string(length) ⇒ Object

Return the six-digit prefix for an element of the given length.



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# File 'lib/rubyslim/list_serializer.rb', line 41

def self.length_string(length)
  sprintf("%06d:",length)
end

.serialize(list) ⇒ Object

Serialize a list according to the SliM protocol.

Lists are enclosed in square-brackets ‘[…]’. Inside the opening bracket is a six-digit number indicating the length of the list (number of items), then a colon ‘:’, then the serialization of each list item. For example:

[]         => "[000000:]"
["hello"]  => "[000001:000005:hello:]"
[1]        => "[000001:000001:1:]"

Strings are preceded by a six-digit sequence indicating their length:

""         => "000000:"
"hello"    => "000005:hello"
nil        => "000004:null"

See spec/list_serializer_spec.rb for more examples.



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# File 'lib/rubyslim/list_serializer.rb', line 23

def self.serialize(list)
  result = "["
  result += length_string(list.length)

  # Serialize each item in the list
  list.each do |item|
    item = "null" if item.nil?
    item = serialize(item) if item.is_a?(Array)
    item = item.to_s
    result += length_string(item.jlength)
    result += item + ":"
  end

  result += "]"
end