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How can I use substructures? #2

Description

@disazoz

How can I use WString as substructure for CommandReadVariable? And is it possible to get length of WString inside CommandReadVariable?

def wstring(length: int, *, default: str = ...):
    return adapter(
        encode=lambda value, ctx: value.encode("utf-16le"),
        decode=lambda value, ctx: value.decode("utf-16le"),
    )(field(length, default=default))

@dataclass
class WString(DataStruct):
    variable_length: int = built("H", lambda ctx: len(ctx.variable_name))
    variable_name: str = wstring(lambda ctx: ctx.variable_length * 2)

@dataclass
class CommandReadVariable(DataStruct):
  tag_id: int = field('H', default= 1)
  message_length: int = built("H", lambda ctx: len(ctx.variable_name) * 2 + 3)
  message_type: MessageType = const(MessageType.CommandReadVariable)(field("B"))
  variable_name: WString

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