Module: OTNetstring

Defined in:
lib/otnetstring.rb

Defined Under Namespace

Classes: Error

Class Method Summary collapse

Class Method Details

.encode(obj, string_sep = ',') ⇒ Object 



62
63
64
65
66
67
68
69
70
71
72
 
# File 'lib/otnetstring.rb', line 62

def encode(obj, string_sep = ',')
  case obj
  when String   then with_encoding "#{obj.bytesize}#{string_sep}#{obj}", "binary"
  when Integer  then encode(obj.inspect, '#')
  when NilClass then "0~"
  when Array    then encode(obj.map { |e| encode(e) }.join, '[')
  when Hash     then encode(obj.map { |a,b| encode(a)+encode(b) }.join, '{')
  when FalseClass, TrueClass then encode(obj.inspect, '!')
  else raise Error, 'cannot encode %p' % obj
  end
end

.parse(io, encoding = 'internal', fallback_encoding = nil) ⇒ Object 



28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
 
# File 'lib/otnetstring.rb', line 28

def parse(io, encoding = 'internal', fallback_encoding = nil)
  fallback_encoding = io.encoding if io.respond_to? :encoding
  io = StringIO.new(io) if io.respond_to? :to_str
  length, byte = String.new, nil

  while byte.nil? || byte =~ /\d/
    length << byte if byte
    byte = io.read(1)
  end

  if length.size > 9
    raise Error, "#{length} is longer than 9 digits"
  elsif length !~ /\d+/
    raise Error, "Expected '#{byte}' to be a digit"
  end
  length = Integer(length)

  case byte
  when '#' then Integer io.read(length)
  when ',' then with_encoding io.read(length), encoding, fallback_encoding
  when '~' then
    raise Error, "nil has length of 0, #{length} given" unless length == 0
  when '!' then io.read(length) == 'true'
  when '[', '{'
    array = []
    start = io.pos
    array << parse(io, encoding, fallback_encoding) while io.pos - start < length
    raise Error, 'Nested element longer than container' if io.pos - start != length
    byte == "{" ? Hash[*array] : array
  else
    raise Error, "Unknown type '#{byte}'"
  end
end