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Finish the full Elixir transcoder #3

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54 changes: 36 additions & 18 deletions lib/transcoder.ex
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Original file line number Diff line number Diff line change
@@ -1,31 +1,49 @@
defmodule Couchie.Transcoder do
require Bitwise
use Bitwise

@cbe_json 0x02
@cbe_raw 0x04
@cbe_str 0x08
@json_flag 0x2
@raw_flag 0x4
@str_flag 0x8

#API defined by cberl_transcoder.erl
#Currently: Ignore flags, everything goes thru jazz
def encode_value(flags, value) do
JSON.encode!(value)
end
## Encoder

def decode_value(flags, value) do
JSON.decode!(value, keys: :atoms)
end
def encode_value(encoders, value),
do: do_encode_value(flag(encoders), value)

def do_encode_value(flag, value) when (flag &&& @json_flag) === @json_flag,
do: do_encode_value(flag ^^^ @json_flag, JSON.encode!(value))

def do_encode_value(flag, value) when (flag &&& @raw_flag) === @raw_flag,
do: do_encode_value(flag ^^^ @raw_flag, :erlang.term_to_binary(value))

def do_encode_value(flag, value) when (flag &&& @str_flag) === @str_flag and is_binary(value),
do: do_encode_value(flag ^^^ @str_flag, value)

def do_encode_value(_, value), do: value

## Decoder

def decode_value(flag, value) when (flag &&& @json_flag) === @json_flag,
do: decode_value(flag ^^^ @json_flag, JSON.decode!(value, keys: :atoms))

def decode_value(flag, value) when (flag &&& @raw_flag) === @raw_flag,
do: decode_value(flag ^^^ @raw_flag, :erlang.binary_to_term(value))

def decode_value(flag, value) when (flag &&& @str_flag) === @str_flag,
do: decode_value(flag ^^^ @str_flag, value)

def decode_value(_, value), do: value

def flag(encoders) when is_list(encoders) do
List.foldr(encoders, 0, fn (x, acc) -> Bitwise.bor(acc, x) end)
List.foldr(encoders, 0, &Bitwise.bor(&2, &1))
end

def flag(encoder) do
case encoder do
:standard -> @cbe_json
:json -> @cbe_json
:raw_binary -> @cbe_raw
:str -> @cbe_str
:standard -> @json_flag
:json -> @json_flag
:raw_binary -> @raw_flag
:str -> @str_flag
end
end

end