Module: Solana::Ruby::Kit::Codecs::DataStructures

Extended by:
DataStructures, T::Sig
Included in:
Solana::Ruby::Kit::Codecs, DataStructures
Defined in:
lib/solana/ruby/kit/codecs/data_structures.rb

Overview

Data-structure codecs — mirrors @solana/codecs-data-structures.

Instance Method Summary collapse

Instance Method Details

#array_codec(element_codec, size: nil) ⇒ Object 



67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
 
# File 'lib/solana/ruby/kit/codecs/data_structures.rb', line 67

def array_codec(element_codec, size: nil)
  if size
    fixed = element_codec.fixed_size ? size * T.must(element_codec.fixed_size) : nil
    enc = Encoder.new(fixed_size: fixed) do |values|
      T.cast(values, T::Array[T.untyped]).map { |v| element_codec.encode(v) }.join.b
    end
    dec = Decoder.new(fixed_size: fixed) do |bytes, offset|
      result   = []
      consumed = 0
      size.times do
        val, n = element_codec.decode(bytes, offset: offset + consumed)
        result << val
        consumed += n
      end
      [result, consumed]
    end
    Codec.new(enc, dec)
  else
    prefix = Numbers.u32_codec
    enc = Encoder.new do |values|
      arr    = T.cast(values, T::Array[T.untyped])
      header = prefix.encode(arr.length)
      body   = arr.map { |v| element_codec.encode(v) }.join.b
      header + body
    end
    dec = Decoder.new do |bytes, offset|
      len, prefix_bytes = prefix.decode(bytes, offset: offset)
      result   = []
      consumed = prefix_bytes
      len.times do
        val, n = element_codec.decode(bytes, offset: offset + consumed)
        result << val
        consumed += n
      end
      [result, consumed]
    end
    Codec.new(enc, dec)
  end
end

#map_codec(key_codec, value_codec, size: nil) ⇒ Object 



110
111
112
113
114
115
116
117
 
# File 'lib/solana/ruby/kit/codecs/data_structures.rb', line 110

def map_codec(key_codec, value_codec, size: nil)
  pair_codec = tuple_codec([key_codec, value_codec])
  array_codec(pair_codec, size: size).transform_decoder do |pairs|
    pairs.each_with_object({}) { |(k, v), h| h[k] = v }
  end.transform_encoder do |hash|
    T.cast(hash, T::Hash[T.untyped, T.untyped]).map { |k, v| [k, v] }
  end
end

#option_codec(value_codec) ⇒ Object 



159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
 
# File 'lib/solana/ruby/kit/codecs/data_structures.rb', line 159

def option_codec(value_codec)
  disc = Numbers.u8_codec
  enc = Encoder.new do |option|
    if option.is_a?(Solana::Ruby::Kit::Options::Some)
      disc.encode(1) + value_codec.encode(option.value)
    else
      disc.encode(0)
    end
  end
  dec = Decoder.new do |bytes, offset|
    flag, flag_size = disc.decode(bytes, offset: offset)
    if flag == 1
      val, n = value_codec.decode(bytes, offset: offset + flag_size)
      [Solana::Ruby::Kit::Options::Some.new(val), flag_size + n]
    else
      [Solana::Ruby::Kit::Options::None.constants, flag_size]
    end
  end
  Codec.new(enc, dec)
end

#set_codec(element_codec, size: nil) ⇒ Object 



121
122
123
124
125
 
# File 'lib/solana/ruby/kit/codecs/data_structures.rb', line 121

def set_codec(element_codec, size: nil)
  array_codec(element_codec, size: size)
    .transform_encoder { |s| T.cast(s, T::Set[T.untyped]).to_a }
    .transform_decoder { |arr| Set.new(arr) }
end

#struct_codec(fields) ⇒ Object 



20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
 
# File 'lib/solana/ruby/kit/codecs/data_structures.rb', line 20

def struct_codec(fields)
  fixed = fields.all? { |_, c| c.fixed_size }
  total = fixed ? fields.sum { |_, c| T.must(c.fixed_size) } : nil

  enc = Encoder.new(fixed_size: total) do |value|
    h = T.cast(value, T::Hash[T.untyped, T.untyped])
    fields.map { |name, codec| codec.encode(h[name] || h[name.to_s]) }.join.b
  end
  dec = Decoder.new(fixed_size: total) do |bytes, offset|
    result   = {}
    consumed = 0
    fields.each do |name, codec|
      val, n = codec.decode(bytes, offset: offset + consumed)
      result[name.to_sym] = val
      consumed += n
    end
    [result, consumed]
  end
  Codec.new(enc, dec)
end

#tuple_codec(codecs) ⇒ Object 



43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
 
# File 'lib/solana/ruby/kit/codecs/data_structures.rb', line 43

def tuple_codec(codecs)
  fixed = codecs.all?(&:fixed_size)
  total = fixed ? codecs.sum { |c| T.must(c.fixed_size) } : nil

  enc = Encoder.new(fixed_size: total) do |values|
    arr = T.cast(values, T::Array[T.untyped])
    codecs.each_with_index.map { |c, i| c.encode(arr[i]) }.join.b
  end
  dec = Decoder.new(fixed_size: total) do |bytes, offset|
    result   = []
    consumed = 0
    codecs.each do |c|
      val, n = c.decode(bytes, offset: offset + consumed)
      result << val
      consumed += n
    end
    [result, consumed]
  end
  Codec.new(enc, dec)
end

#union_codec(variants, discriminator_codec) ⇒ Object 



137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
 
# File 'lib/solana/ruby/kit/codecs/data_structures.rb', line 137

def union_codec(variants, discriminator_codec)
  tag_to_codec  = variants.to_h
  idx_to_tag    = variants.map(&:first)

  enc = Encoder.new do |tagged_value|
    tag, value = T.cast(tagged_value, [T.untyped, T.untyped])
    inner_codec = tag_to_codec.fetch(tag) { Kernel.raise ArgumentError, "Unknown union tag: #{tag}" }
    discriminator_codec.encode(idx_to_tag.index(tag)) + inner_codec.encode(value)
  end
  dec = Decoder.new do |bytes, offset|
    idx, disc_size = discriminator_codec.decode(bytes, offset: offset)
    tag        = idx_to_tag.fetch(idx) { Kernel.raise ArgumentError, "Unknown union discriminant: #{idx}" }
    inner      = tag_to_codec.fetch(tag)
    value, n   = inner.decode(bytes, offset: offset + disc_size)
    [[tag, value], disc_size + n]
  end
  Codec.new(enc, dec)
end