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DEVDOC.md

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Serialization Grammar

message -> '0x01' call
        | '0x00' element
        | '0xff' fail
        | byebye
call -> string list
list -> int32 {element} int32 {named_element} attributes
attributes -> nattributes {named_element}
nattributes -> uint8
named_element -> string element
element -> '0x00'
        | '0x01' dimensions {double} attributes
        | '0x02' dimensions {complex} attributes
        | '0x03' dimensions {raw} attributes
        | '0x04' dimensions {integer} attributes
        | '0x05' dimensions {boolean}
        | '0x06' dimensions {string} attributes
        | '0x07' list
        | '0xcb' callback
        | '0xee' expression
callback -> int32
string -> int32 utf8string
dimensions -> ndimensions {int32}
ndimensions -> int32
fail -> string
byebye -> '0xbb'

Meaning of the int32 numbers

  • A string is preceded by the number of bytes to UTF-8-encode the string.
  • The sequence of unnamed/positional elements in a list is preceded by the number of (named) elements that follow.

Types

Lists that have the attribute "JLTYPE" will be coerced to the corresponding Julia type.

Conversion table for bitstypes:

Type attributes are specified via the attribute "JLTYPE".

Julia type R type
Float64 double
Float16, Float32 double with type attribute
Int64 integer if it fits into 32 bits, otherwise double with type attribute
Int8, Int16, UInt16, Int32, Char integer with type attribute
UInt8 raw
UInt32, UInt64, Int128, UInt128 raw with type attribute