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A fast, easy to use and 100% conformant Elixir library for Google Protocol Buffers (aka protobuf)
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lib/google/protobuf/value.ex
# Proto definition
# https://github.com/protocolbuffers/protobuf/blob/master/src/google/protobuf/struct.proto
# JSON encoding
# https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#value
defmodule Protox.Google.Protobuf.Value do
@moduledoc false
use Protox.Define,
enums: [],
messages: [
%Protox.Message{
name: Google.Protobuf.Value,
syntax: :proto3,
fields: [
Protox.Field.new!(
kind: {:oneof, :kind},
label: :optional,
name: :null_value,
tag: 1,
type: {:enum, Google.Protobuf.NullValue}
),
Protox.Field.new!(
kind: {:oneof, :kind},
label: :optional,
name: :number_value,
tag: 2,
type: :double
),
Protox.Field.new!(
kind: {:oneof, :kind},
label: :optional,
name: :string_value,
tag: 3,
type: :string
),
Protox.Field.new!(
kind: {:oneof, :kind},
label: :optional,
name: :bool_value,
tag: 4,
type: :bool
),
Protox.Field.new!(
kind: {:oneof, :kind},
label: :optional,
name: :struct_value,
tag: 5,
type: {:message, Google.Protobuf.Struct}
),
Protox.Field.new!(
kind: {:oneof, :kind},
label: :optional,
name: :list_value,
tag: 6,
type: {:message, Google.Protobuf.ListValue}
)
]
}
]
end
defimpl Protox.JsonMessageDecoder, for: Google.Protobuf.Value do
def decode_message(initial_message, value) when is_boolean(value) do
struct!(initial_message, kind: {:bool_value, value})
end
def decode_message(initial_message, nil = _value) do
struct!(initial_message, kind: {:null_value, :NULL_VALUE})
end
def decode_message(initial_message, value) when is_binary(value) do
struct!(initial_message, kind: {:string_value, value})
end
def decode_message(initial_message, value) when is_number(value) do
struct!(initial_message, kind: {:number_value, value})
end
def decode_message(initial_message, value) when is_list(value) do
list_value = Protox.JsonMessageDecoder.decode_message(%Google.Protobuf.ListValue{}, value)
struct!(initial_message, kind: {:list_value, list_value})
end
def decode_message(initial_message, value) when is_map(value) do
struct_value = Protox.JsonMessageDecoder.decode_message(%Google.Protobuf.Struct{}, value)
struct!(initial_message, kind: {:struct_value, struct_value})
end
end
defimpl Protox.JsonMessageEncoder, for: Google.Protobuf.Value do
def encode_message(%Google.Protobuf.Value{kind: {kind, value}}, json_encode)
when kind in [:bool_value, :string_value, :number_value] do
json_encode.(value)
end
def encode_message(%Google.Protobuf.Value{kind: {:null_value, :NULL_VALUE}}, json_encode) do
json_encode.(nil)
end
def encode_message(
%Google.Protobuf.Value{kind: {:list_value, %Google.Protobuf.ListValue{} = list_value}},
json_encode
) do
Protox.JsonMessageEncoder.encode_message(list_value, json_encode)
end
def encode_message(
%Google.Protobuf.Value{kind: {:struct_value, %Google.Protobuf.Struct{} = struct_value}},
json_encode
) do
Protox.JsonMessageEncoder.encode_message(struct_value, json_encode)
end
def encode_message(%Google.Protobuf.Value{kind: _}, _json_encode) do
raise Protox.JsonEncodingError.new("invalid field :kind for Value")
end
end