Source code for MDAnalysis.topology.FHIAIMSParser
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"""
FHI-AIMS Topology Parser --- :mod:`MDAnalysis.topolgy.FHIAIMSParser`
====================================================================
Reads an `FHI-AIMS`_ ``.in`` file and pulls the atom information from it.
Because an FHI-AIMS input file only has atom name information, any
information about residues and segments will not be populated.
.. _`FHI-AIMS`: https://aimsclub.fhi-berlin.mpg.de/
See Also
--------
:mod:`MDAnalysis.coordinates.FHIAIMS`
Classes
-------
.. autoclass:: FHIAIMSParser
:members:
:inherited-members:
"""
import numpy as np
from ..lib.util import openany
from .base import TopologyReaderBase
from ..core.topology import Topology
from ..core.topologyattrs import (
Atomnames,
Atomids,
Resids,
Resnums,
Segids,
Elements,
)
[docs]
class FHIAIMSParser(TopologyReaderBase):
"""Parse a list of atoms from an FHI-AIMS file
Creates the following attributes:
- Atomnames
.. note::
By default, atomtypes and masses will be guessed on Universe creation.
This may change in release 3.0.
See :ref:`Guessers` for more information.
.. versionchanged:: 2.8.0
Removed type and mass guessing (attributes guessing takes place now
through universe.guess_TopologyAttrs() API).
"""
format = ['IN', 'FHIAIMS']
[docs]
def parse(self, **kwargs):
"""Read the file and return the structure.
Returns
-------
MDAnalysis Topology object
"""
# FHIAIMS geometry files are only single frames
names = []
skip_tags = ["#", "lattice_vector", "initial_moment", "velocity"]
with openany(self.filename) as inf:
for line in inf:
line = line.strip()
if line.startswith("atom"):
names.append(line.split()[-1])
continue
if any([line.startswith(tag) for tag in skip_tags]):
continue
# we are now seeing something that's neither atom nor lattice
raise ValueError(
'Non-conforming line: ({0})in FHI-AIMS input file {0}'.format(line, self.filename))
names = np.asarray(names)
natoms = len(names)
attrs = [Atomnames(names),
Atomids(np.arange(natoms) + 1),
Resids(np.array([1])),
Resnums(np.array([1])),
Segids(np.array(['SYSTEM'], dtype=object)),
Elements(names)]
top = Topology(natoms, 1, 1,
attrs=attrs)
return top