ASN1Tools Fails to Compile 3GPP Release 16 ASN.1

[btsimon97]

When trying to compile 3GPP's ASN.1 for S1AP Release 16 using asn1tools version 0.164.0, the compilation fails with the following error:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/asn1_venv/lib/python3.10/site-packages/asn1tools/compiler.py", line 376, in compile_files
    return compile_dict(parse_files(filenames, encoding),
  File "/asn1_venv/lib/python3.10/site-packages/asn1tools/compiler.py", line 308, in compile_dict
    return Specification(codec.compile_dict(specification,
  File "/asn1_venv/lib/python3.10/site-packages/asn1tools/codecs/ber.py", line 1773, in compile_dict
    return Compiler(specification, numeric_enums).process()
  File "/asn1_venv/lib/python3.10/site-packages/asn1tools/codecs/compiler.py", line 210, in process
    self.pre_process()
  File "/asn1_venv/lib/python3.10/site-packages/asn1tools/codecs/compiler.py", line 257, in pre_process
    self.pre_process_parameterization_step_1(module['types'],
  File "/asn1_venv/lib/python3.10/site-packages/asn1tools/codecs/compiler.py", line 529, in pre_process_parameterization_step_1
    self.pre_process_parameterization_step_1_type(type_descriptor,
  File "/asn1_venv/lib/python3.10/site-packages/asn1tools/codecs/compiler.py", line 548, in pre_process_parameterization_step_1_type
    self.pre_process_parameterization_step_1_type(member,
  File "/asn1_venv/lib/python3.10/site-packages/asn1tools/codecs/compiler.py", line 590, in pre_process_parameterization_step_1_type
    self.pre_process_parameterization_step_1_dummy_to_actual_type(
  File "/asn1_venv/lib/python3.10/site-packages/asn1tools/codecs/compiler.py", line 629, in pre_process_parameterization_step_1_dummy_to_actual_type
    self.pre_process_parameterization_step_1_dummy_to_actual_type(
  File "/asn1_venv/lib/python3.10/site-packages/asn1tools/codecs/compiler.py", line 643, in pre_process_parameterization_step_1_dummy_to_actual_type
    if parameter['type'] == dummy_parameter:
TypeError: string indices must be integers

This occurs either when the various S1AP ASN.1 definitions are in separate files or concatenated into a single file. The S1AP-IEs or S1AP-Containers definitions appears to be the offending definitions as compilation completes okay without including them, although this leaves the compiled ASN1 missing the actual definitions needed to encode/decode S1AP messages.

[btsimon97]

On further testing this appears to apply with R15 and R14 S1AP as well.

[hyrut]

Is any update?
I have same issue when I use asn1tools to compile 3GPP TS38.413 release v17.4.0 for NGAP decoding.
ans1tools version is 0.166.0

Traceback (most recent call last):
File "/mnt/e/Work/programming/python/testASN1/test.py", line 20, in
ngap_coder = asn1tools.compile_files(["NGAP-PDU-Descriptions.asn","NGAP-CommonDataTypes.asn","NGAP-IEs.asn","NGAP-Containers.asn"], 'per')
File "/usr/local/lib/python3.10/dist-packages/asn1tools/compiler.py", line 380, in compile_files
return compile_dict(parse_files(filenames, encoding),
File "/usr/local/lib/python3.10/dist-packages/asn1tools/compiler.py", line 312, in compile_dict
return Specification(codec.compile_dict(specification,
File "/usr/local/lib/python3.10/dist-packages/asn1tools/codecs/per.py", line 2246, in compile_dict
return Compiler(specification, numeric_enums).process()
File "/usr/local/lib/python3.10/dist-packages/asn1tools/codecs/compiler.py", line 210, in process
self.pre_process()
File "/usr/local/lib/python3.10/dist-packages/asn1tools/codecs/compiler.py", line 257, in pre_process
self.pre_process_parameterization_step_1(module['types'],
File "/usr/local/lib/python3.10/dist-packages/asn1tools/codecs/compiler.py", line 529, in pre_process_parameterization_step_1
self.pre_process_parameterization_step_1_type(type_descriptor,
File "/usr/local/lib/python3.10/dist-packages/asn1tools/codecs/compiler.py", line 548, in pre_process_parameterization_step_1_type
self.pre_process_parameterization_step_1_type(member,
File "/usr/local/lib/python3.10/dist-packages/asn1tools/codecs/compiler.py", line 590, in pre_process_parameterization_step_1_type
self.pre_process_parameterization_step_1_dummy_to_actual_type(
File "/usr/local/lib/python3.10/dist-packages/asn1tools/codecs/compiler.py", line 629, in pre_process_parameterization_step_1_dummy_to_actual_type
self.pre_process_parameterization_step_1_dummy_to_actual_type(
File "/usr/local/lib/python3.10/dist-packages/asn1tools/codecs/compiler.py", line 646, in pre_process_parameterization_step_1_dummy_to_actual_type
if parameter['type'] == dummy_parameter:
TypeError: string indices must be integers

[laf0rge]

I think the README.md clearly states which language features are supported and not.

Most 3GPP (particularly NAS, but also S1AP) specifications make use of information object classes / the CLASS keyword.

The README.md says The CLASS keyword (X.681) and its friends are not yet supported.