No way to place long boolean expressions on separate lines

Suppose I have the following emboss definitions, along with a very long boolean expression:

enum PacketType:
  FOO = 0
  BAR = 1
  BAZ = 2
  ABC = 3
  DEF = 4
  GHI = 5

struct MyStruct:
  0 [+1] PacketType packet_type

  if packet_type == PacketType.FOO || packet_type == PacketType.BAR || packet_type == PacketType.BAZ || packet_type == PacketType.ABC|| packet_type == PacketType.DEF || packet_type == PacketType.GHI:
    # ...

For readability's sake, I'd like to be able to break up the boolean expression into multiple lines, like this:

struct MyStruct:
  0 [+1] PacketType packet_type

  if packet_type == PacketType.FOO ||
     packet_type == PacketType.BAR ||
     packet_type == PacketType.BAZ ||
     packet_type == PacketType.ABC||
     packet_type == PacketType.DEF ||
     packet_type == PacketType.GHI:
    # ...

Doing so results in the following error:

error: Syntax error
note: Found '\n' ("\n"), expected "$max", CamelWord, "(", SnakeWord, "$max_size_in_bits", "$upper_bound", "$is_statically_sized", "-", ShoutyWord, "$size_in_bytes", "$max_size_in_bytes", BooleanConstant, "$min_size_in_bytes", "$static_size_in_bits", "$present", "+", Number, "$lower_bound", "$next", "$size_in_bits", "$min_size_in_bits".
  if packet_type == PacketType.FOO ||
                                     ^

Placing the || as a line prefix doesn't work either:

struct MyStruct:
  0     [+1]    PacketType  packet_type
  if packet_type == PacketType.FOO
    || packet_type == PacketType.BAR
    || packet_type == PacketType.BAZ
    || packet_type == PacketType.ABC
    || packet_type == PacketType.DEF:
    # ...

Doing so results in the following error:

error: Syntax error
note: Found '\n' ("\n"), expected "-", "?", "&&", "==", "<", "+", ">", "<=", ":", ">=", "*", "||".
  if packet_type == PacketType.FOO
                                  ^

Using a backslash to indicate a continuation of the line on the next also doesn't work:

struct MyStruct:
  0     [+1]    PacketType  packet_type
  if packet_type == PacketType.FOO || \
    packet_type == PacketType.BAR || \
    packet_type == PacketType.BAZ || \
    packet_type == PacketType.ABC || \
    packet_type == PacketType.DEF:
    $next [+1]  UInt        data

Doing so results in the following error:

error: Unrecognized token
  if packet_type == PacketType.FOO || \
                                      ^

Using a backslash to indicate a continuation of the line along with using the || as a line prefix also doesn't work:

struct MyStruct:
  0     [+1]    PacketType  packet_type
  if packet_type == PacketType.FOO \
    || packet_type == PacketType.BAR \
    || packet_type == PacketType.BAZ \
    || packet_type == PacketType.ABC \
    || packet_type == PacketType.DEF:
    $next [+1]  UInt        data

Doing so results in the following error:

error: Unrecognized token
  if packet_type == PacketType.FOO \
                                   ^

It seems like there is no way to have multi-line boolean expressions at the moment.

google / emboss

No way to place long boolean expressions on separate lines #140