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"""Helper functions for read_fdf."""
from pathlib import Path
from re import compile
import numpy as np
from ase import Atoms
from ase.utils import reader
_label_strip_re = compile(r'[\s._-]')
def _labelize(raw_label):
# Labels are case insensitive and -_. should be ignored, lower and strip it
return _label_strip_re.sub('', raw_label).lower()
def _is_block(val):
# Tell whether value is a block-value or an ordinary value.
# A block is represented as a list of lists of strings,
# and a ordinary value is represented as a list of strings
if isinstance(val, list) and \
len(val) > 0 and \
isinstance(val[0], list):
return True
return False
def _get_stripped_lines(fd):
# Remove comments, leading blanks, and empty lines
return [_f for _f in [L.split('#')[0].strip() for L in fd] if _f]
@reader
def _read_fdf_lines(file):
# Read lines and resolve includes
lbz = _labelize
lines = []
for L in _get_stripped_lines(file):
w0 = lbz(L.split(None, 1)[0])
if w0 == '%include':
# Include the contents of fname
fname = L.split(None, 1)[1].strip()
parent_fname = getattr(file, 'name', None)
if isinstance(parent_fname, str):
fname = Path(parent_fname).parent / fname
lines += _read_fdf_lines(fname)
elif '<' in L:
L, fname = L.split('<', 1)
w = L.split()
fname = fname.strip()
if w0 == '%block':
# "%block label < filename" means that the block contents
# should be read from filename
if len(w) != 2:
raise IOError('Bad %%block-statement "%s < %s"' %
(L, fname))
label = lbz(w[1])
lines.append('%%block %s' % label)
lines += _get_stripped_lines(open(fname))
lines.append('%%endblock %s' % label)
else:
# "label < filename.fdf" means that the label
# (_only_ that label) is to be resolved from filename.fdf
label = lbz(w[0])
fdf = read_fdf(fname)
if label in fdf:
if _is_block(fdf[label]):
lines.append('%%block %s' % label)
lines += [' '.join(x) for x in fdf[label]]
lines.append('%%endblock %s' % label)
else:
lines.append('%s %s' % (label, ' '.join(fdf[label])))
# else:
# label unresolved!
# One should possibly issue a warning about this!
else:
# Simple include line L
lines.append(L)
return lines
def read_fdf(fname):
"""Read a siesta style fdf-file.
The data is returned as a dictionary
( label:value ).
All labels are converted to lower case characters and
are stripped of any '-', '_', or '.'.
Ordinary values are stored as a list of strings (splitted on WS),
and block values are stored as list of lists of strings
(splitted per line, and on WS).
If a label occurres more than once, the first occurrence
takes precedence.
The implementation applies no intelligence, and does not
"understand" the data or the concept of units etc.
Values are never parsed in any way, just stored as
split strings.
The implementation tries to comply with the fdf-format
specification as presented in the siesta 2.0.2 manual.
An fdf-dictionary could e.g. look like this::
{'atomiccoordinatesandatomicspecies': [
['4.9999998', '5.7632392', '5.6095972', '1'],
['5.0000000', '6.5518100', '4.9929091', '2'],
['5.0000000', '4.9746683', '4.9929095', '2']],
'atomiccoordinatesformat': ['Ang'],
'chemicalspecieslabel': [['1', '8', 'O'],
['2', '1', 'H']],
'dmmixingweight': ['0.1'],
'dmnumberpulay': ['5'],
'dmusesavedm': ['True'],
'latticeconstant': ['1.000000', 'Ang'],
'latticevectors': [
['10.00000000', '0.00000000', '0.00000000'],
['0.00000000', '11.52647800', '0.00000000'],
['0.00000000', '0.00000000', '10.59630900']],
'maxscfiterations': ['120'],
'meshcutoff': ['2721.139566', 'eV'],
'numberofatoms': ['3'],
'numberofspecies': ['2'],
'paobasissize': ['dz'],
'solutionmethod': ['diagon'],
'systemlabel': ['H2O'],
'wavefunckpoints': [['0.0', '0.0', '0.0']],
'writedenchar': ['T'],
'xcauthors': ['PBE'],
'xcfunctional': ['GGA']}
"""
fdf = {}
lbz = _labelize
lines = _read_fdf_lines(fname)
while lines:
w = lines.pop(0).split(None, 1)
if lbz(w[0]) == '%block':
# Block value
if len(w) == 2:
label = lbz(w[1])
content = []
while True:
if len(lines) == 0:
raise IOError('Unexpected EOF reached in %s, '
'un-ended block %s' % (fname, label))
w = lines.pop(0).split()
if lbz(w[0]) == '%endblock':
break
content.append(w)
if label not in fdf:
# Only first appearance of label is to be used
fdf[label] = content
else:
raise IOError('%%block statement without label')
else:
# Ordinary value
label = lbz(w[0])
if len(w) == 1:
# Siesta interpret blanks as True for logical variables
fdf[label] = []
else:
fdf[label] = w[1].split()
return fdf
def read_struct_out(fd):
"""Read a siesta struct file"""
cell = []
for i in range(3):
line = next(fd)
v = np.array(line.split(), float)
cell.append(v)
natoms = int(next(fd))
numbers = np.empty(natoms, int)
scaled_positions = np.empty((natoms, 3))
for i, line in enumerate(fd):
tokens = line.split()
numbers[i] = int(tokens[1])
scaled_positions[i] = np.array(tokens[2:5], float)
return Atoms(numbers,
cell=cell,
pbc=True,
scaled_positions=scaled_positions)
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