pycrate_asn1compile.py -g

[russhousley]

Has anyone tried to write a different generator for use with pycrate_asn1compile.py? Just copying the generator from https://github.com/P1sec/pycrate/blob/master/pycrate_asn1c/generator.py, and adjusting the import statements to work for the directory containing the code does not provide a starting point. I get:

$pycrate_asn1compile.py -i foo.asn -o foo -g ./mygen.py /opt/local/Library/Frameworks/Python.framework/Versions/2.7/bin/pycrate_asn1compile.py, args error: generator file does not contain a _Generator class in module <module 'mygen' from './mygen.pyc'> $

Any hints about getting started would be most welcome.

[p1-bmu]

As you can see in the pycrate_asn1compile.py tool, a custom code generator must have a _Generator subclass with a destination filename passed as init argument. This subclass is then called to work on all ASN.1 modules available into GLOBAL.MOD. This is the case of both PycrateGenerator and JSONDepGraphGenerator in generator.py.

Here is a skeleton for such a generator, if you prefer:

from pycrate_asn1c.generator import _Generator
from pycrate_asn1c.asnproc   import GLOBAL

class MyCodeGenerator(_Generator):

    def __init__(self, dstfile='/tmp/generated.txt'):
        print('Hello, I am a code generator !')
        print('There are %i modules to work on' % len(GLOBAL.MOD))
        # TODO: now generate some output from GLOBAL.MOD

I hope this helps.