Class: Erlang::ETF::Map

Inherits:
Object
  • Object
show all
Includes:
Term
Defined in:
lib/erlang/etf/map.rb

Overview

1 4 N
116 Arity Pairs

MAP_EXT encodes a map. The Arity field is an unsigned 4 byte integer in big endian format that determines the number of key-value pairs in the map. Key and value pairs (Ki => Vi) are encoded in the Pairs section in the following order: K1, V1, K2, V2,..., Kn, Vn. Duplicate keys are not allowed within the same map.

(see MAP_EXT)

Constant Summary collapse

UINT32BE = 
Erlang::ETF::Term::UINT32BE

Constants included from Term

Term::ATOM_CACHE_REF, Term::ATOM_EXT, Term::ATOM_INTERNAL_REF2, Term::ATOM_INTERNAL_REF3, Term::ATOM_UTF8_EXT, Term::BINARY_ENCODING, Term::BINARY_EXT, Term::BINARY_INTERNAL_REF, Term::BIT_BINARY_EXT, Term::BIT_BINARY_INTERNAL_REF, Term::COMPRESSED, Term::DIST_HEADER, Term::DOUBLE, Term::DOUBLEBE, Term::DOUBLELE, Term::ERLANG_MAGIC_BYTE, Term::EXPORT_EXT, Term::FLOAT_EXT, Term::FUN_EXT, Term::INT128, Term::INT128BE, Term::INT128LE, Term::INT16, Term::INT16BE, Term::INT16LE, Term::INT32, Term::INT32BE, Term::INT32LE, Term::INT64, Term::INT64BE, Term::INT64LE, Term::INT8, Term::INTEGER_EXT, Term::LARGE_BIG_EXT, Term::LARGE_TUPLE_EXT, Term::LIST_EXT, Term::MAP_EXT, Term::NEW_FLOAT_EXT, Term::NEW_FUN_EXT, Term::NEW_REFERENCE_EXT, Term::NIL_EXT, Term::PID_EXT, Term::PORT_EXT, Term::REFERENCE_EXT, Term::SINGLE, Term::SINGLEBE, Term::SINGLELE, Term::SMALL_ATOM_EXT, Term::SMALL_ATOM_UTF8_EXT, Term::SMALL_BIG_EXT, Term::SMALL_INTEGER_EXT, Term::SMALL_TUPLE_EXT, Term::STRING_EXT, Term::UINT128, Term::UINT128BE, Term::UINT128LE, Term::UINT16, Term::UINT16BE, Term::UINT16LE, Term::UINT32, Term::UINT32LE, Term::UINT64, Term::UINT64BE, Term::UINT64LE, Term::UINT8

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Term

#<=>, binary_encoding, #eql?, #erlang_external_type, #hash, included, #to_erlang_etf

Constructor Details

#initialize(term, pairs = nil) ⇒ Map

Returns a new instance of Map.

Raises:

  • (ArgumentError) 


40
41
42
43
44
 
# File 'lib/erlang/etf/map.rb', line 40

def initialize(term, pairs = nil)
  raise ArgumentError, "term must be of type Map" if not Erlang.is_map(term)
  @term = term
  @pairs = pairs.freeze
end

Class Method Details

.[](term, pairs = nil) ⇒ Object 



25
26
27
28
29
 
# File 'lib/erlang/etf/map.rb', line 25

def [](term, pairs = nil)
  return term if term.kind_of?(Erlang::ETF::Term)
  term = Erlang.from(term)
  return new(term, pairs)
end

.erlang_load(buffer) ⇒ Object 



31
32
33
34
35
36
37
 
# File 'lib/erlang/etf/map.rb', line 31

def erlang_load(buffer)
  arity, = buffer.read(4).unpack(UINT32BE)
  pairs = Array.new(arity * 2)
  (arity * 2).times { |i| pairs[i] = Erlang::ETF.read_term(buffer) }
  map = Erlang::Map[*pairs]
  return new(map, pairs)
end

Instance Method Details

#erlang_dump(buffer = ::String.new.force_encoding(BINARY_ENCODING)) ⇒ Object 



46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
 
# File 'lib/erlang/etf/map.rb', line 46

def erlang_dump(buffer = ::String.new.force_encoding(BINARY_ENCODING))
  buffer << MAP_EXT
  if @pairs
    arity = @pairs.length.div(2)
    buffer << [arity].pack(UINT32BE)
    (arity * 2).times { |i| Erlang::ETF.write_term(@pairs[i], buffer) }
  else
    arity = @term.size
    buffer << [arity].pack(UINT32BE)
    @term.sort.each { |key, val|
      Erlang::ETF.write_term(key, buffer)
      Erlang::ETF.write_term(val, buffer)
    }
  end
  return buffer
end

#inspect ⇒ Object 



63
64
65
66
67
68
69
 
# File 'lib/erlang/etf/map.rb', line 63

def inspect
  if @pairs.nil?
    return super
  else
    return "#{self.class}[#{@term.inspect}, #{@pairs.inspect}]"
  end
end

#pretty_print(pp) ⇒ Object 



71
72
73
74
75
76
77
78
 
# File 'lib/erlang/etf/map.rb', line 71

def pretty_print(pp)
  state = [@term]
  state.push(@pairs) if not @pairs.nil?
  return pp.group(1, "#{self.class}[", "]") do
    pp.breakable ''
    pp.seplist(state) { |obj| obj.pretty_print(pp) }
  end
end