🎉500 Issues🎉 The 'xM' shortcut can fail to parse

[tjlaboss]

Describe the bug

Parsing the XM shortcut in a U (Universe) input leads to node being None

To Reproduce

montepy.read_input("testi.i")

Error Message

Traceback (most recent call last):
  File "./badinterp/mwe.py", line 2, in <module>
    deck = montepy.read_input("testi.i")
  File "./badinterp/montepy/input_parser/input_reader.py", line 29, in read_input
    problem.parse_input(replace=replace)
  File "./badinterp/montepy/mcnp_problem.py", line 272, in parse_input
    obj = obj_parser(input)
  File "./badinterp/montepy/data_inputs/data_parser.py", line 46, in parse_data
    return data_class(input)
  File "./badinterp/montepy/data_inputs/universe_input.py", line 44, in __init__
    node.is_negatable_identifier = True
AttributeError: 'NoneType' object has no attribute 'is_negatable_identifier'

MCNP input file snippet

MCNP Test Model
C Cells
C Graveyard
99    0 +1010
C Seven spheres within a sphere
1 1 -10 -1001
2 1 -10 -1002
3 1 -10 -1003
4 1 -10 -1004
5 1 -10 -1005
6 1 -10 -1006
7 1 -10 -1007
8     0 -1010  1001  1002  1003  1004  1005  1006  1007

C surfaces
1001 SO      0.1
1002 SX -1.1 0.1
1003 SX +1.1 0.1
1004 SY -1.1 0.1
1005 SY +1.1 0.1
1006 SZ -1.1 0.1
1007 SZ +1.1 0.1
1010 SO 3

C data
C mX fails to parse
C     _ 1  2 10 _ 3 21 21
U     J 1 2M 5M J 3 7M 1M
C materials
C UO2 5 atpt enriched
m1        92235.80c           5
          92238.80c          95
C execution
ksrc 0 0 0
kcode 100000 1.000 50 1050
mode n p

Version

• Version 0.2.10 - 0.3.3

Additional context

Other shortcut issues: #397, #489, and #499

This one appears to be just a code bug, rather than a problem with shortcut expansions.

[tjlaboss]

Worth noting: this isn't due to the Jump entry. Any Universe number works as well.

[MicahGale]

Should we jump a shark?

[tjlaboss]

[MicahGale]

Wait wait wait wait:

U J 1 2X 5X J 3 7X 1X

Is valid syntax? The documentation clearly says it should be 2M...

[tjlaboss]

Oops, my brain is tired from opening so many issues. That should have been an M. The issue still occurs.

I'll update the issue description to specifically be for Universe inputs.

[MicahGale]

Ohhh ok. I was about to have an existential crisis.

[MicahGale]

How critical is this? I feel like not super critical given there's a workaround.

[tjlaboss]

This is a low-priority issue. Perhaps we should add a tag for such.