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

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

Overview

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

Class Method Summary collapse

Class Method Details

.array_codec(element_codec, size: nil) ⇒ Object 



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# File 'lib/solana/ruby/kit/codecs/data_structures.rb', line 63

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 



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# File 'lib/solana/ruby/kit/codecs/data_structures.rb', line 106

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 



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# File 'lib/solana/ruby/kit/codecs/data_structures.rb', line 155

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 



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# File 'lib/solana/ruby/kit/codecs/data_structures.rb', line 117

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 



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# File 'lib/solana/ruby/kit/codecs/data_structures.rb', line 16

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 



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# File 'lib/solana/ruby/kit/codecs/data_structures.rb', line 39

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 



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# File 'lib/solana/ruby/kit/codecs/data_structures.rb', line 133

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