A general-purpose parser for formatted data output.
Very frustratingly, some codes do not provide easy access to results in binary format. Instead, you have to write yet another plain text parser. Parsec tries to solve this problem by generalizing the process of parsing a formatted output file. The user just has to create a dictionary defining the structure of his/her formatted output. The format dictionary is a nested dictionary of regular expressions which define section start tokens. The leaves of this tree data structure are function objects which are called when the line is processed. Because the logic of parsing is separated from the structure of the formatted output, this should make it easier to write formatted text parsers in da future.
A test script which parses test/meshtal is provided in test/parsemeshta.py.
From the root directory of parsec run the test parser as a module
python -m test.parse_meshtalNote that all that the user has to do to produce this output is create a
dictionary _format in test/parse_meshtal.py
_format = {
re.compile(r'^(mcnp\s+version)') : version_number,
re.compile(r' Mesh Tally Number\s+(\d{1,8})') : {
re.compile(r'^\s+(\w) direction') : extents,
re.compile(r'^\s+(X\s+Y\s+Z\s+Result\s+Rel Error)') : named,
},
re.compile(r'made_up') : 's',
}, define the leaf node functions, and call
parsec(inputfile, _format)The formatted data
Mesh Tally Number 314
This is a neutron mesh tally.
Tally bin boundaries:
X direction: -10.71 10.71
Y direction: -10.71 10.71
Z direction: -183.00 183.00
Energy bin boundaries: 0.00E+00 1.00E+36
X Y Z Result Rel Error
0.000 0.000 0.000 0.00000E+00 0.00000E+00
Mesh Tally Number 324
This is a neutron mesh tally.
Tally bin boundaries:
X direction: 53.55 74.97
Y direction: 32.13 53.55
Z direction: -183.00 183.00
Energy bin boundaries: 0.00E+00 1.00E+36
X Y Z Result Rel Error
64.260 42.840 0.000 0.00000E+00 0.00000E+00
...
is converted to an in-memory representation
{'314': {'X': {u'max': '10.71', u'min': '-10.71'},
'X Y Z Result Rel Error': {u'RelError': '0.00000E+00',
u'Result': '0.00000E+00',
u'X': '0.000',
u'Y': '0.000',
u'Z': '0.000'},
'Y': {u'max': '10.71', u'min': '-10.71'},
'Z': {u'max': '183.00', u'min': '-183.00'}},
'324': {'X': {u'max': '74.97', u'min': '53.55'},
'X Y Z Result Rel Error': {u'RelError': '0.00000E+00',
u'Result': '0.00000E+00',
u'X': '64.260',
u'Y': '42.840',
u'Z': '0.000'},
'Y': {u'max': '53.55', u'min': '32.13'},
'Z': {u'max': '183.00', u'min': '-183.00'}},
...