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"""
A module for reading and writing crystal structures from JSV
See http://www.jcrystal.com/steffenweber/JAVA/JSV/jsv.html
By Jesper Friis, Jan. 2012
"""
import re
import numpy as np
import ase
from ase.spacegroup import Spacegroup, crystal
from ase.geometry import cellpar_to_cell, cell_to_cellpar
def read_jsv(f):
"""Reads a JSV file."""
natom = nbond = npoly = 0
symbols = []
labels = []
cellpar = basis = title = bonds = poly = origin = shell_numbers = None
spacegroup = 1
headline = f.readline().strip()
while True:
line = f.readline()
if not line:
break
line = line.strip()
m = re.match(r'^\[([^]]+)\]\s*(.*)', line)
if m is None or not line:
continue
tag = m.groups()[0].lower()
if len(m.groups()) > 1:
args = m.groups()[1].split()
else:
args = []
if tag == 'cell':
cellpar = [float(x) for x in args]
elif tag == 'natom':
natom = int(args[0])
elif tag == 'nbond':
nbond = int(args[0])
# optional margin of the bondlengths
elif tag == 'npoly':
npoly = int(args[0])
elif tag == 'space_group':
spacegroup = Spacegroup(*tuple(int(x) for x in args))
elif tag == 'title':
title = m.groups()[1]
elif tag == 'atoms':
symbols = []
basis = np.zeros((natom, 3), dtype=float)
shell_numbers = -np.ones((natom, ), dtype=int) # float?
for i in range(natom):
tokens = f.readline().strip().split()
labels.append(tokens[0])
symbols.append(ase.data.chemical_symbols[int(tokens[1])])
basis[i] = [float(x) for x in tokens[2:5]]
if len(tokens) > 5:
shell_numbers[i] = float(tokens[5]) # float?
elif tag == 'bonds':
for i in range(nbond):
f.readline()
bonds = NotImplemented
elif tag == 'poly':
for i in range(npoly):
f.readline()
poly = NotImplemented
elif tag == 'origin':
origin = NotImplemented
else:
raise ValueError('Unknown tag: "%s"' % tag)
if headline == 'asymmetric_unit_cell':
atoms = crystal(symbols=symbols,
basis=basis,
spacegroup=spacegroup,
cellpar=cellpar,
)
elif headline == 'full_unit_cell':
atoms = ase.Atoms(symbols=symbols,
scaled_positions=basis,
cell=cellpar_to_cell(cellpar),
)
atoms.info['spacegroup'] = Spacegroup(spacegroup)
elif headline == 'cartesian_cell':
atoms = ase.Atoms(symbols=symbols,
positions=basis,
cell=cellpar_to_cell(cellpar),
)
atoms.info['spacegroup'] = Spacegroup(spacegroup)
else:
raise ValueError('Invalid JSV file type: "%s"' % headline)
atoms.info['title'] = title
atoms.info['labels'] = labels
if bonds is not None:
atoms.info['bonds'] = bonds
if poly is not None:
atoms.info['poly'] = poly
if origin is not None:
atoms.info['origin'] = origin
if shell_numbers is not None:
atoms.info['shell_numbers'] = shell_numbers
return atoms
def write_jsv(f, atoms):
"""Writes JSV file."""
f.write('asymmetric_unit_cell\n')
f.write('[cell]')
for v in cell_to_cellpar(atoms.cell):
f.write(' %g' % v)
f.write('\n')
f.write('[natom] %d\n' % len(atoms))
f.write('[nbond] 0\n') # FIXME
f.write('[npoly] 0\n') # FIXME
if 'spacegroup' in atoms.info:
sg = Spacegroup(atoms.info['spacegroup'])
f.write('[space_group] %d %d\n' % (sg.no, sg.setting))
else:
f.write('[space_group] 1 1\n')
f.write('[title] %s\n' % atoms.info.get('title', 'untitled'))
f.write('\n')
f.write('[atoms]\n')
if 'labels' in atoms.info:
labels = atoms.info['labels']
else:
labels = ['%s%d' % (s, i + 1) for i, s in
enumerate(atoms.get_chemical_symbols())]
numbers = atoms.get_atomic_numbers()
scaled = atoms.get_scaled_positions()
for l, n, p in zip(labels, numbers, scaled):
f.write('%-4s %2d %9.6f %9.6f %9.6f\n' % (l, n, p[0], p[1], p[2]))
f.write('Label AtomicNumber x y z (repeat natom times)\n')
f.write('\n')
f.write('[bonds]\n')
f.write('\n')
f.write('[poly]\n')
f.write('\n')
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