Class: Protod::Interpreter::Builtin

Inherits:
Object
  • Object
show all
Defined in:
lib/protod/interpreter/builtin.rb

Class Method Summary collapse

Class Method Details

.setup! ⇒ Object 



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# File 'lib/protod/interpreter/builtin.rb', line 6

def self.setup!
  google_protobuf = Protod.find_or_register_package('google.protobuf')
  google_type     = Protod.find_or_register_package('google.type', url: 'https://github.com/googleapis/googleapis.git')

  Interpreter.register_for('RBS::Types::Bases::Any', parent: google_protobuf, path: 'google/protobuf/any.proto', force: false, ignore: true) do
    def proto_ident
      'Any'
    end

    def to_pb_from(rb)
      i = Protod::Interpreter.find_by(rb.class)

      raise NotImplementedError, "Not found the interpreter for #{rb.class.name}. You can define a interpreter using Protod::Interpreter.register_for" unless i

      value = if i.pb_const
                pb = i.to_pb_from(rb)

                pb.protod__object_id = rb.object_id.to_s if pb.respond_to?(:protod__object_id)

                i.pb_const.encode(pb)
              elsif i.proto_ident
                pb = i.to_pb_from(rb)

                case i.proto_ident
                when 'bool'
                  # ref: https://github.com/ruby-protobuf/protobuf/blob/b866fc5667226d0582f328ab24c648e578c5a380/lib/protobuf/field/bool_field.rb#L46
                  [pb ? 1 : 0].pack('C')
                when 'double'
                  # ref: https://github.com/ruby-protobuf/protobuf/blob/b866fc5667226d0582f328ab24c648e578c5a380/lib/protobuf/field/double_field.rb#L16
                  [pb].pack('E')
                when 'sint64', 'sint32'
                  # ref: https://github.com/ruby-protobuf/protobuf/blob/b866fc5667226d0582f328ab24c648e578c5a380/lib/protobuf/field/signed_integer_field.rb#L20-L24
                  if pb >= 0
                    varint_encode(pb << 1)
                  else
                    varint_encode(~(pb << 1))
                  end
                when 'uint64'
                  # ref: https://github.com/ruby-protobuf/protobuf/blob/b866fc5667226d0582f328ab24c648e578c5a380/lib/protobuf/field/varint_field.rb#L68
                  varint_encode(pb)
                when 'string', 'bytes'
                  # ref: https://github.com/ruby-protobuf/protobuf/blob/b866fc5667226d0582f328ab24c648e578c5a380/lib/protobuf/field/string_field.rb#L37-L43
                  v = "" + pb
                  if i.proto_ident == 'string' && v.encoding != ::Encoding::UTF_8
                    v.encode!(::Encoding::UTF_8, :invalid => :replace, :undef => :replace, :replace => "")
                  end
                  v.force_encoding(::Encoding::BINARY)
                else
                  raise NotImplementedError, "Unsupported #{i.proto_ident} on #{__method__} for #{const.name}"
                end
              end

      Google::Protobuf::Any.new(type_url: "/#{i.proto_full_ident}", value: value)
    end

    def to_rb_from(pb)
      i = Protod::Interpreter.find_by_proto(pb.type_url.split('/').last)

      raise NotImplementedError, "Not found the interpreter for #{pb.type_url}. You can define a interpreter using Protod::Interpreter.register_for" unless i

      value = if i.pb_const
                i.pb_const.decode(pb.value)
              elsif i.proto_ident
                case i.proto_ident
                when 'bool'
                  pb.value.unpack('C').first == 1
                when 'double'
                  pb.value.unpack('E').first
                when 'sint64', 'sint32'
                  v = varint_decode(StringIO.new(pb.value))

                  (v & 1).zero? ? v >> 1 : ~v >> 1
                when 'uint64'
                  varint_decode(StringIO.new(pb.value))
                when 'string', 'bytes'
                  pb.value.dup.force_encoding(i.proto_ident == 'string' ? ::Encoding::UTF_8 : ::Encoding::BINARY)
                else
                  raise NotImplementedError, "Unsupported #{i.proto_ident} on #{__method__} for #{const.name}"
                end
              end

      i.to_rb_from(value)
    end

    private

    # ref: https://github.com/ruby-protobuf/protobuf/blob/b866fc5667226d0582f328ab24c648e578c5a380/lib/protobuf/varint_pure.rb#L10-L29

    def varint_encode(value)
      bytes = []
      until value < 128
        bytes << (0x80 | (value & 0x7f))
        value >>= 7
      end
      (bytes << value).pack('C*')
    end

    def varint_decode(stream)
      value = index = 0
      begin
        byte = stream.readbyte
        value |= (byte & 0x7f) << (7 * index)
        index += 1
      end while (byte & 0x80).nonzero?
      value
    end
  end

  Interpreter.register_for(*%w[RBS::Types::Bases::Void RBS::Types::Bases::Nil], force: false, ignore: true) do
    def proto_ident
      nil
    end

    def to_pb_from(rb)
      nil
    end

    def to_rb_from(pb)
      nil
    end
  end

  Interpreter.register_for('TrueClass', 'FalseClass', 'RBS::Types::Bases::Bool', force: false, ignore: true) do
    def proto_ident
      'bool'
    end

    def to_pb_from(rb)
      rb ? true : false
    end

    def to_rb_from(pb)
      pb
    end
  end

  Interpreter.register_for('Numeric', force: false, ignore: true) do
    def proto_ident
      'double'
    end

    def to_pb_from(rb)
      rb.to_f
    end

    def to_rb_from(pb)
      pb
    end
  end

  Interpreter.register_for('Integer', force: false, ignore: true) do
    def proto_ident
      'sint64'
    end

    def to_pb_from(rb)
      rb.to_i
    end

    def to_rb_from(pb)
      pb
    end
  end

  Interpreter.register_for('Fixnum', force: false, ignore: true) do
    def proto_ident
      'sint32'
    end

    def to_pb_from(rb)
      rb.to_i
    end

    def to_rb_from(pb)
      pb
    end
  end

  Interpreter.register_for('String', force: false, ignore: true) do
    def proto_ident
      'string'
    end

    def to_pb_from(rb)
      rb.to_s
    end

    def to_rb_from(pb)
      pb
    end
  end

  Interpreter.register_for('BigDecimal', parent: google_type, path: 'google/type/decimal.proto', force: false, ignore: true) do
    def proto_ident
      'Decimal'
    end

    def to_pb_from(rb)
      Google::Type::Decimal.new(value: rb.to_s)
    end

    def to_rb_from(pb)
      BigDecimal(pb.value)
    end
  end

  Interpreter.register_for('Date', parent: google_type, path: 'google/type/date.proto', force: false, ignore: true) do
    def proto_ident
      'Date'
    end

    def to_pb_from(rb)
      Google::Type::Date.new(year: rb.year, month: rb.month, day: rb.day)
    end

    def to_rb_from(pb)
      ::Date.new(pb.year, pb.month, pb.day)
    end
  end

  Interpreter.register_for('Time', 'DateTime', 'ActiveSupport::TimeWithZone', parent: google_protobuf, path: 'google/protobuf/timestamp.proto', force: false, ignore: true) do
    def proto_ident
      'Timestamp'
    end

    def to_pb_from(rb)
      Google::Protobuf::Timestamp.new(seconds: rb.to_i, nanos: rb.nsec)
    end

    def to_rb_from(pb)
      ::Time.zone.at(pb.seconds, pb.nanos, :nanosecond)
    end
  end

  Interpreter.register_for('Protod::Types::Binary', force: false, ignore: true) do
    def proto_ident
      'bytes'
    end

    def to_pb_from(rb)
      rb
    end

    def to_rb_from(pb)
      pb
    end
  end

  Interpreter.register_for('Protod::Types::UnsignedInteger', force: false, ignore: true) do
    def proto_ident
      'uint64'
    end

    def to_pb_from(rb)
      rb.to_i
    end

    def to_rb_from(pb)
      pb
    end
  end

  Interpreter.register_for('Array', force: false, ignore: true) do
    def proto_message
      Protod::Proto::Message.new(
        ident: proto_ident,
        fields: [Protod::Proto::Field.build_from('RBS::Types::Bases::Any', ident: 'values', optional: true, repeated: true)]
      )
    end

    def to_pb_from(rb)
      i = Protod::Interpreter.find_by('RBS::Types::Bases::Any')

      pb_const.new(values: rb.map { i.to_pb_from(_1) })
    end

    def to_rb_from(pb)
      i = Protod::Interpreter.find_by('RBS::Types::Bases::Any')

      pb.values.map { i.to_rb_from(_1) }
    end
  end

  Interpreter.register_for('Hash', parent: google_protobuf, path: 'google/protobuf/struct.proto', force: false, ignore: true) do
    def proto_ident
      'Struct'
    end

    def to_pb_from(rb)
      Google::Protobuf::Struct.from_hash(rb)
    end

    def to_rb_from(pb)
      pb.to_h
    end
  end

  Interpreter.register_for(*['Data', 'Struct'].select(&:safe_constantize), force: false, ignore: true) do
    def proto_message
      Protod::Proto::Message.new(
        ident: proto_ident,
        fields: const.memebers.map do |name|
          Protod::Proto::Field.build_from('RBS::Types::Bases::Any', ident: name, optional: true)
        end
      )
    end

    def to_pb_from(rb)
      attributes = const.members.map { [_1, rb.public_send(_1)] }.to_h

      pb_const.new(**attributes)
    end

    def to_rb_from(pb)
      attributes = const.members.map { [_1, pb.public_send(_1)] }.to_h

      const.new(**attributes)
    end
  end
end