Unwrapping (~) not supported in CDDL

[dgpetrie]

CDDL RFC 8610 section 3.7. Unwrapping defines the use of the tilde (~) character operator for unwrapping a map. When zcbor encounters a tilda in the CDDL it throws an exception.

import zcbor
cddl_str = """
second_type = {
~ first_type,
param3: uint,
}

first_type = {
param1: tstr,
param2: uint
}
"""
cddl_res = zcbor.zcbor.zcbor.DataTranslator.from_cddl(cddl_str, 100)

yields:

Traceback (most recent call last):
File "/usr/local/lib/python3.8/dist-packages/zcbor/zcbor/zcbor.py", line 903, in get_value
handler(self, match_str)
File "/usr/local/lib/python3.8/dist-packages/zcbor/zcbor/zcbor.py", line 775, in
lambda m_self, map_str: m_self.type_and_value(
File "/usr/local/lib/python3.8/dist-packages/zcbor/zcbor/zcbor.py", line 530, in type_and_value
self.set_value(value_generator)
File "/usr/local/lib/python3.8/dist-packages/zcbor/zcbor/zcbor.py", line 533, in set_value
value = value_generator()
File "/usr/local/lib/python3.8/dist-packages/zcbor/zcbor/zcbor.py", line 776, in
"MAP", lambda: m_self.parse(map_str))),
File "/usr/local/lib/python3.8/dist-packages/zcbor/zcbor/zcbor.py", line 990, in parse
instr = value.get_value(instr)
File "/usr/local/lib/python3.8/dist-packages/zcbor/zcbor/zcbor.py", line 914, in get_value
raise TypeError("Could not parse this: '%s'" % instr)
TypeError: Could not parse this: '~ first_type, param3: uint,'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "", line 1, in
File "/usr/local/lib/python3.8/dist-packages/zcbor/zcbor/zcbor.py", line 281, in from_cddl
parsed.get_value(cddl_string.replace("\n", " ").lstrip("&"))
File "/usr/local/lib/python3.8/dist-packages/zcbor/zcbor/zcbor.py", line 905, in get_value
raise Exception("Failed while parsing this: '%s'" % match_str) from e
Exception: Failed while parsing this: ' ~ first_type, param3: uint, '

[oyvindronningstad]

Thanks for reporting. Unwrapping is one of the features mentioned as unsupported in the release notes. I will note this down as a request so I'm more likely to implement it.