Parser issue

[MostafaGomaa]

Dear maintainers,

Thanks for the work invested in the repo.

When I try to use translate.py with python3 it seems like the parser gets stuck in infinite recursive calls.
python3 $TFD_HOME/translate/translate.py domain.pddl problem.pddl

.....
  File "...TemporalFastDownward/downward/translate/pddl/pddl_file.py", line 15, in parse_pddl_file
    return parser.parse_nested_list(open(filename))
  File "...TemporalFastDownward/downward/translate/pddl/pddl_file.py", line 44, in open
    domain_pddl = parse_pddl_file("domain", domain_filename)
  File "...TemporalFastDownward/downward/translate/pddl/pddl_file.py", line 15, in parse_pddl_file
    return parser.parse_nested_list(open(filename))
  File "...TemporalFastDownward/downward/translate/pddl/pddl_file.py", line 44, in open
    domain_pddl = parse_pddl_file("domain", domain_filename)
  File "...TemporalFastDownward/downward/translate/pddl/pddl_file.py", line 15, in parse_pddl_file
    return parser.parse_nested_list(open(filename))
  File "...TemporalFastDownward/downward/translate/pddl/pddl_file.py", line 44, in open
    domain_pddl = parse_pddl_file("domain", domain_filename)
  File "...TemporalFastDownward/downward/translate/pddl/pddl_file.py", line 15, in parse_pddl_file
    return parser.parse_nested_list(open(filename))
  File "...TemporalFastDownward/downward/translate/pddl/pddl_file.py", line 44, in open
    domain_pddl = parse_pddl_file("domain", domain_filename)
  File "...TemporalFastDownward/downward/translate/pddl/pddl_file.py", line 15, in parse_pddl_file
    return parser.parse_nested_list(open(filename))
  File "...TemporalFastDownward/downward/translate/pddl/pddl_file.py", line 44, in open
    domain_pddl = parse_pddl_file("domain", domain_filename)
  File "..TemporalFastDownward/downward/translate/pddl/pddl_file.py", line 15, in parse_pddl_file
    return parser.parse_nested_list(open(filename))
  File "...TemporalFastDownward/downward/translate/pddl/pddl_file.py", line 44, in open
    domain_pddl = parse_pddl_file("domain", domain_filename)
  File "...TemporalFastDownward/downward/translate/pddl/pddl_file.py", line 15, in parse_pddl_file
    return parser.parse_nested_list(open(filename))
  File "...TemporalFastDownward/downward/translate/pddl/pddl_file.py", line 44, in open
    domain_pddl = parse_pddl_file("domain", domain_filename)
  File "...TemporalFastDownward/downward/translate/pddl/pddl_file.py", line 15, in parse_pddl_file
    return parser.parse_nested_list(open(filename))
  File "...TemporalFastDownward/downward/translate/pddl/pddl_file.py", line 34, in open
    dirname, basename = os.path.split(task_filename)
  File "/usr/lib/python3.9/posixpath.py", line 104, in split
    sep = _get_sep(p)
  File "/usr/lib/python3.9/posixpath.py", line 42, in _get_sep
    if isinstance(path, bytes):

As far as I could dig, this seems to be caused by the change

982e9a4#diff-00f68d6d7b9e60fd1c9500c7436acddf2c2feb8277faa3eb0120bb7e5ac8170bR14

- return parser.parse_nested_list(file(filename))
+ #return parser.parse_nested_list(file(filename))
+ return parser.parse_nested_list(open(filename))

Am I missing something obvious?

[LonyuNaz]

I don't know if you fixed this already, but I think open(filename) was meant to use the builtin open() function of python, instead of pddl.open() which it does.

How I managed to fix this:

import io

return parser.parse_nested_list(io.open(filename))