def parseLines(self, lines):
"""Parse list of lines in RAWXYZ format.
Return Structure object or raise StructureFormatError.
"""
linefields = [l.split() for l in lines]
# prepare output structure
stru = Structure()
# find first valid record
start = 0
for field in linefields:
if len(field) == 0 or field[0] == "#":
start += 1
else:
break
# find the last valid record
stop = len(lines)
while stop > start and len(linefields[stop - 1]) == 0:
stop -= 1
# get out for empty structure
if start >= stop:
return stru
# here we have at least one valid record line
# figure out xyz layout from the first line for plain and raw formats
floatfields = [isfloat(f) for f in linefields[start]]
nfields = len(linefields[start])
if nfields not in (3, 4):
emsg = ("%d: invalid RAWXYZ format, expected 3 or 4 columns" %
(start + 1))
raise StructureFormatError(emsg)
if floatfields[:3] == [True, True, True]:
el_idx, x_idx = (None, 0)
elif floatfields[:4] == [False, True, True, True]:
el_idx, x_idx = (0, 1)
else:
emsg = "%d: invalid RAWXYZ format" % (start + 1)
raise StructureFormatError(emsg)
# now try to read all record lines
try:
p_nl = start
for fields in linefields[start:]:
p_nl += 1
if fields == []:
continue
elif len(fields) != nfields:
emsg = ('%d: all lines must have ' +
'the same number of columns') % p_nl
raise StructureFormatError, emsg
symbol = el_idx is not None and fields[el_idx] or ""
xyz = [float(f) for f in fields[x_idx:x_idx + 3]]
if len(xyz) == 2:
xyz.append(0.0)
stru.addNewAtom(symbol, xyz=xyz)
except ValueError:
emsg = "%d: invalid number" % p_nl
exc_type, exc_value, exc_traceback = sys.exc_info()
raise StructureFormatError, emsg, exc_traceback
return stru
def getParser(format):
"""Return Parser instance for a given structure format.
Raises StructureFormatError exception when format is not defined.
"""
if format not in parser_index:
emsg = "no parser for '%s' format" % format
raise StructureFormatError(emsg)
pmod = parser_index[format]['module']
import_cmd = 'from matter.Parsers import %s as pm' % pmod
exec(import_cmd)
return pm.getParser()
def parseLines(self, lines):
"""Parse list of lines in PDB format.
Return Structure instance or raise StructureFormatError.
"""
try:
stru = Structure()
scale = numpy.identity(3, dtype=float)
scaleU = numpy.zeros(3, dtype=float)
p_nl = 0
for line in lines:
p_nl += 1
# skip blank lines
if not line.strip(): continue
# make sure line has 80 characters
if len(line) < 80:
line = "%-80s" % line
words = line.split()
record = words[0]
if record == "TITLE":
continuation = line[8:10]
if continuation.strip():
stru.description += line[10:].rstrip()
else:
stru.description = line[10:].rstrip()
elif record == "CRYST1":
a = float(line[7:15])
b = float(line[15:24])
c = float(line[24:33])
alpha = float(line[33:40])
beta = float(line[40:47])
gamma = float(line[47:54])
stru.lattice.setLatPar(a, b, c, alpha, beta, gamma)
scale = numpy.transpose(stru.lattice.recbase)
elif record == "SCALE1":
sc = numpy.zeros((3,3), dtype=float)
sc[0,:] = [float(x) for x in line[10:40].split()]
scaleU[0] = float(line[45:55])
elif record == "SCALE2":
sc[1,:] = [float(x) for x in line[10:40].split()]
scaleU[1] = float(line[45:55])
elif record == "SCALE3":
sc[2,:] = [float(x) for x in line[10:40].split()]
scaleU[2] = float(line[45:55])
base = numpy.transpose(numpy.linalg.inv(sc))
abcABGcryst = numpy.array(stru.lattice.abcABG())
stru.lattice.setLatBase(base)
abcABGscale = numpy.array(stru.lattice.abcABG())
reldiff = numpy.fabs(1.0 - abcABGscale/abcABGcryst)
if not numpy.all(reldiff < self.epsilon):
emsg = "%d: " % p_nl + \
"SCALE and CRYST1 are not consistent."
raise StructureFormatError(emsg)
if numpy.any(scaleU != 0.0):
emsg = "Origin offset not yet implemented."
raise NotImplementedError(emsg)
elif record in ("ATOM", "HETATM"):
name = line[12:16].strip()
rc = [float(x) for x in line[30:54].split()]
xyz = numpy.dot(scale, rc) + scaleU
try:
occupancy = float(line[54:60])
except ValueError:
occupancy = 1.0
try:
B = float(line[60:66])
U = numpy.identity(3)*B/(8*pi**2)
except ValueError:
U = numpy.zeros((3,3), dtype=float)
symbol = line[76:78].strip()
if symbol == "":
# get symbol from the first 2 characters of name
symbol = line[12:14].strip()
symbol = symbol[0].upper() + symbol[1:].lower()
#stru.addNewAtom(symbol, occupancy=occupancy, name=name, U=U)
stru.addNewAtom(symbol, occupancy=occupancy, label=name, U=U)
last_atom = stru.getLastAtom()
last_atom.xyz_cartn = rc
elif record == "SIGATM":
sigrc = [float(x) for x in line[30:54].split()]
sigxyz = numpy.dot(scale, sigrc)
try:
sigo = float(line[54:60])
except ValueError:
sigo = 0.0
try:
sigB = float(line[60:66])
sigU = numpy.identity(3)*sigB/(8*pi**2)
except ValueError:
sigU = numpy.zeros((3,3), dtype=float)
last_atom.sigxyz = sigxyz
last_atom.sigo = sigo
last_atom.sigU = sigU
elif record == "ANISOU":
Uij = [ float(x)*1.0e-4 for x in line[28:70].split() ]
for i in range(3):
last_atom.U[i,i] = Uij[i]
last_atom.U[0,1] = last_atom.U[1,0] = Uij[3]
last_atom.U[0,2] = last_atom.U[2,0] = Uij[4]
last_atom.U[1,2] = last_atom.U[2,1] = Uij[5]
elif record == "SIGUIJ":
sigUij = [ float(x)*1.0e-4 for x in line[28:70].split() ]
for i in range(3):
last_atom.sigU[i,i] = sigUij[i]
last_atom.sigU[0,1] = last_atom.sigU[1,0] = sigUij[3]
last_atom.sigU[0,2] = last_atom.sigU[2,0] = sigUij[4]
last_atom.sigU[1,2] = last_atom.sigU[2,1] = sigUij[5]
elif record in P_pdb.validRecords:
pass
else:
emsg = "%d: invalid record name '%r'" % (p_nl, record)
raise StructureFormatError(emsg)
except (ValueError, IndexError):
emsg = "%d: invalid PDB record" % p_nl
exc_type, exc_value, exc_traceback = sys.exc_info()
raise StructureFormatError, emsg, exc_traceback
return stru
for fmt in ofmts:
p = getParser(fmt)
try:
stru = p.parseLines(lines)
self.format = fmt
break
except StructureFormatError, err:
parsers_emsgs.append("%s: %s" % (fmt, err))
except NotImplementedError:
pass
if stru is None:
emsg = "\n".join([
"Unknown or invalid structure format.",
"Errors per each tested structure format:"
] + parsers_emsgs)
raise StructureFormatError(emsg)
self.__dict__.update(p.__dict__)
return stru
# End of parseLines
# End of class P_auto
# Routines
def getParser():
return P_auto()
def parseLines(self, lines):
"""Parse list of lines in PDFfit format.
Return Structure object or raise StructureFormatError.
"""
p_nl = 0
rlist = []
try:
self.stru = PDFFitStructure()
stru = self.stru
cell_line_read = False
stop = len(lines)
while stop > 0 and lines[stop - 1].strip() == "":
stop -= 1
ilines = iter(lines[:stop])
# read header of PDFFit file
for l in ilines:
p_nl += 1
words = l.split()
if len(words) == 0 or words[0][0] == '#':
continue
elif words[0] == 'title':
stru.description = l.lstrip()[5:].strip()
elif words[0] == 'scale':
stru.pdffit['scale'] = float(words[1])
elif words[0] == 'sharp':
l1 = l.replace(',', ' ')
sharp_pars = [float(w) for w in l1.split()[1:]]
if len(sharp_pars) < 4:
stru.pdffit['delta2'] = sharp_pars[0]
stru.pdffit['sratio'] = sharp_pars[1]
stru.pdffit['rcut'] = sharp_pars[2]
else:
stru.pdffit['delta2'] = sharp_pars[0]
stru.pdffit['delta1'] = sharp_pars[1]
stru.pdffit['sratio'] = sharp_pars[2]
stru.pdffit['rcut'] = sharp_pars[3]
elif words[0] == 'spcgr':
key = 'spcgr'
start = l.find(key) + len(key)
value = l[start:].strip()
stru.pdffit['spcgr'] = value
elif words[0] == 'shape':
self._parse_shape(l)
elif words[0] == 'cell':
cell_line_read = True
l1 = l.replace(',', ' ')
latpars = [float(w) for w in l1.split()[1:7]]
stru.lattice = Lattice(*latpars)
elif words[0] == 'dcell':
l1 = l.replace(',', ' ')
stru.pdffit['dcell'] = [float(w) for w in l1.split()[1:7]]
elif words[0] == 'ncell':
l1 = l.replace(',', ' ')
stru.pdffit['ncell'] = [int(w) for w in l1.split()[1:5]]
elif words[0] == 'format':
if words[1] != 'pdffit':
emsg = "%d: file is not in PDFfit format" % p_nl
raise StructureFormatError(emsg)
elif words[0] == 'atoms' and cell_line_read:
break
else:
self.ignored_lines.append(l)
# Header reading finished, check if required lines were present.
if not cell_line_read:
emsg = "%d: file is not in PDFfit format" % p_nl
raise StructureFormatError(emsg)
# Load data from atom entries.
p_natoms = reduce(lambda x, y: x * y, stru.pdffit['ncell'])
# we are now inside data block
for l in ilines:
p_nl += 1
wl1 = l.split()
element = wl1[0][0].upper() + wl1[0][1:].lower()
xyz = [float(w) for w in wl1[1:4]]
occ = float(wl1[4])
stru.addNewAtom(element, xyz=xyz, occupancy=occ)
a = stru.getLastAtom()
p_nl += 1
wl2 = ilines.next().split()
a.sigxyz = [float(w) for w in wl2[0:3]]
a.sigo = float(wl2[3])
p_nl += 1
wl3 = ilines.next().split()
p_nl += 1
wl4 = ilines.next().split()
p_nl += 1
wl5 = ilines.next().split()
p_nl += 1
wl6 = ilines.next().split()
a.sigU = numpy.zeros((3, 3), dtype=float)
a.U11 = float(wl3[0])
a.U22 = float(wl3[1])
a.U33 = float(wl3[2])
a.sigU[0, 0] = float(wl4[0])
a.sigU[1, 1] = float(wl4[1])
a.sigU[2, 2] = float(wl4[2])
a.U12 = float(wl5[0])
a.U13 = float(wl5[1])
a.U23 = float(wl5[2])
a.sigU[0, 1] = a.sigU[1, 0] = float(wl6[0])
a.sigU[0, 2] = a.sigU[2, 0] = float(wl6[1])
a.sigU[1, 2] = a.sigU[2, 1] = float(wl6[2])
if len(stru) != p_natoms:
emsg = "expected %d atoms, read %d" % (p_natoms, len(stru))
raise StructureFormatError(emsg)
if stru.pdffit['ncell'][:3] != [1, 1, 1]:
superlatpars = [
latpars[i] * stru.pdffit['ncell'][i] for i in range(3)
] + latpars[3:]
superlattice = Lattice(*superlatpars)
stru.placeInLattice(superlattice)
stru.pdffit['ncell'] = [1, 1, 1, p_natoms]
except (ValueError, IndexError):
emsg = "%d: file is not in PDFfit format" % p_nl
exc_type, exc_value, exc_traceback = sys.exc_info()
raise StructureFormatError, emsg, exc_traceback
return stru
def toLines(self, stru):
"""Convert Structure stru to a list of lines in XCFG atomeye format.
Return list of strings.
"""
if len(stru) == 0:
emsg = "cannot convert empty structure to XCFG format"
raise StructureFormatError(emsg)
lines = []
lines.append("Number of particles = %i" % len(stru))
# figure out length unit A
allxyz = numpy.array([a.xyz for a in stru])
lo_xyz = numpy.array([allxyz[:, i].min() for i in range(3)])
hi_xyz = numpy.array([allxyz[:, i].max() for i in range(3)])
max_range_xyz = (hi_xyz - lo_xyz).max()
# range of CFG coordinates must be less than 1
p_A = numpy.ceil(max_range_xyz + 1.0e-13)
# atomeye draws rubbish when boxsize is less than 3.5
hi_ucvect = max(
[numpy.sqrt(numpy.dot(v, v)) for v in stru.lattice.base])
if hi_ucvect * p_A < 3.5:
p_A = numpy.ceil(3.5 / hi_ucvect)
lines.append("A = %.8g Angstrom" % p_A)
# how much do we need to shift the coordinates?
p_dxyz = numpy.zeros(3, dtype=float)
for i in range(3):
if lo_xyz[i]/p_A < 0.0 or hi_xyz[i]/p_A >= 1.0 \
or (lo_xyz[i] == hi_xyz[i] and lo_xyz[i] == 0.0) :
p_dxyz[i] = 0.5 - (hi_xyz[i] + lo_xyz[i]) / 2.0 / p_A
# H0 tensor
for i in range(3):
for j in range(3):
lines.append( "H0(%i,%i) = %.8g A" % \
(i+1, j+1, stru.lattice.base[i,j]) )
# get out for empty structure
if len(stru) == 0: return lines
a_first = stru[0]
p_NO_VELOCITY = "v" not in a_first.__dict__
if p_NO_VELOCITY:
lines.append(".NO_VELOCITY.")
# build a p_auxiliaries list of (aux_name,atom_expression) tuples
# if stru came from xcfg file, it would store original auxiliaries in
# xcfg dictionary
try:
p_auxiliaries = [(aux, "a." + aux)
for aux in stru.xcfg['auxiliaries']]
except AttributeError:
p_auxiliaries = []
# add occupancy if any atom has nonunit occupancy
for a in stru:
if a.occupancy != 1.0:
p_auxiliaries.append(('occupancy', 'a.occupancy'))
break
# add temperature factor with as many terms as needed
# check whether all temperature factors are zero or isotropic
p_allUzero = True
p_allUiso = True
for a in stru:
if p_allUzero and numpy.any(a.U != 0.0):
p_allUzero = False
if not numpy.all(a.U == a.U[0, 0] * numpy.identity(3)):
p_allUiso = False
# here p_allUzero must be false
break
if p_allUzero:
pass
elif p_allUiso:
p_auxiliaries.append(('Uiso', 'a.U[0,0]'))
else:
p_auxiliaries.extend([('U11', 'a.U[0,0]'), ('U22', 'a.U[1,1]'),
('U33', 'a.U[2,2]')])
# check if there are off-diagonal elements
allU = numpy.array([a.U for a in stru])
if numpy.any(allU[:, 0, 1] != 0.0):
p_auxiliaries.append(('U12', 'a.U[0,1]'))
if numpy.any(allU[:, 0, 2] != 0.0):
p_auxiliaries.append(('U13', 'a.U[0,2]'))
if numpy.any(allU[:, 1, 2] != 0.0):
p_auxiliaries.append(('U23', 'a.U[1,2]'))
# count entries
p_entry_count = 6 - 3 * p_NO_VELOCITY + len(p_auxiliaries)
lines.append("entry_count = %d" % p_entry_count)
# add auxiliaries
for i in range(len(p_auxiliaries)):
lines.append("auxiliary[%d] = %s [au]" % (i, p_auxiliaries[i][0]))
# now define p_entry_line function for representing atom properties
p_exprs = [
"def p_entry_line(a, p_A, p_dxyz):",
" fields = list( a.xyz/p_A+p_dxyz )"
]
if not p_NO_VELOCITY:
p_exprs.append( \
" fields += [ a.v[0], a.v[1], a.v[2] ]" )
p_exprs += [
" fields += [ " + ",".join([e
for p, e in p_auxiliaries]) + " ]",
" line = ' '.join([ '%.8g' % x for x in fields ])",
" return line"
]
exec "\n".join(p_exprs)
# we are ready to output atoms:
lines.append("")
p_symbol = None
for a in stru:
if a.symbol != p_symbol:
p_symbol = a.symbol
lines.append("%.4f" % AtomicMass.get(p_symbol, 0.0))
lines.append(p_symbol)
lines.append(p_entry_line(a, p_A, p_dxyz))
return lines
def parseLines(self, lines):
"""Parse list of lines in PDB format.
Return Structure object or raise StructureFormatError.
"""
xcfg_Number_of_particles = None
xcfg_A = None
xcfg_H0 = numpy.zeros((3, 3), dtype=float)
xcfg_H0_set = numpy.zeros((3, 3), dtype=bool)
xcfg_NO_VELOCITY = False
xcfg_entry_count = None
xcfg_auxiliary = []
p_nl = 0
p_auxiliary_re = re.compile(r"^auxiliary\[(\d+)\] =")
p_auxiliary = {}
try:
stru = Structure()
# ignore trailing blank lines
stop = len(lines)
while stop > 0 and lines[stop - 1].strip() == "":
stop -= 1
ilines = iter(lines[:stop])
# read XCFG header
for line in ilines:
p_nl += 1
stripped_line = line.strip()
# blank lines and lines starting with # are ignored
if stripped_line == "" or line[0] == '#':
continue
elif xcfg_Number_of_particles is None:
if line.find("Number of particles =") != 0:
emsg = ("%d: first line must " +
"contain 'Number of particles ='") % p_nl
raise StructureFormatError(emsg)
xcfg_Number_of_particles = int(line[21:].split(None, 1)[0])
p_natoms = xcfg_Number_of_particles
elif line.find("A =") == 0:
xcfg_A = float(line[3:].split(None, 1)[0])
elif line.find("H0(") == 0:
i, j = (int(line[3]) - 1, int(line[5]) - 1)
xcfg_H0[i, j] = float(line[10:].split(None, 1)[0])
xcfg_H0_set[i, j] = True
elif line.find(".NO_VELOCITY.") == 0:
xcfg_NO_VELOCITY = True
elif line.find("entry_count =") == 0:
xcfg_entry_count = int(line[13:].split(None, 1)[0])
elif p_auxiliary_re.match(line):
m = p_auxiliary_re.match(line)
idx = int(m.group(1))
p_auxiliary[idx] = line[m.end():].split(None, 1)[0]
else:
break
# check header for consistency
if numpy.any(xcfg_H0_set == False):
emsg = "H0 tensor is not properly defined"
raise StructureFormatError(emsg)
p_auxnum = len(p_auxiliary) and max(p_auxiliary.keys()) + 1
for i in range(p_auxnum):
if not i in p_auxiliary:
p_auxiliary[i] = "aux%d" % i
sorted_aux_keys = p_auxiliary.keys()
sorted_aux_keys.sort()
if p_auxnum != 0:
stru.xcfg = {
'auxiliaries': [p_auxiliary[k] for k in sorted_aux_keys]
}
if 6 - 3 * xcfg_NO_VELOCITY + len(p_auxiliary) != xcfg_entry_count:
emsg = ("%d: auxiliary fields " +
"not consistent with entry_count") % p_nl
raise StructureFormatError(emsg)
# define proper lattice
stru.lattice.setLatBase(xcfg_H0)
# build p_assign_atom function to assign entries to proper fields
p_exprs = [
"a.xyz[0]=fields[0]", "a.xyz[1]=fields[1]",
"a.xyz[2]=fields[2]"
]
if not xcfg_NO_VELOCITY:
p_exprs += [
"a.v=numpy.zeros(3, dtype=float)", "a.v[0]=fields[3]",
"a.v[1]=fields[4]", "a.v[2]=fields[5]"
]
for idx in sorted_aux_keys:
prop = p_auxiliary[idx]
col = idx + 6 - 3 * xcfg_NO_VELOCITY
if prop == "Uiso":
p_exprs.append("a.U[0,0]=a.U[1,1]=a.U[2,2]=" +
"fields[%d]" % col)
elif re.match(r"^U\d\d$", prop) \
and 1<=int(prop[1])<=3 and 1<=int(prop[2])<=3 :
i, j = int(prop[1]) - 1, int(prop[2]) - 1
if i == j:
p_exprs.append("a.U[%i,%i]=fields[%d]" % (i, j, col))
else:
p_exprs.append("a.U[%i,%i]=a.U[%i,%i]=fields[%d]" % \
(i, j, j, i, col) )
else:
p_exprs.append( "a.__dict__[%r]=fields[%d]" % \
(prop, col) )
p_assign_expr = "pass; " + "; ".join(p_exprs[3:])
exec "def p_assign_atom(a, fields) : %s" % p_assign_expr
# here we are inside data
p_element = None
p_nl -= 1
for line in lines[p_nl:stop]:
p_nl += 1
words = line.split()
# ignore atom mass
if len(words) == 1 and isfloat(words[0]):
continue
# parse element allowing empty symbol
elif len(words) <= 1:
w = line.strip()
p_element = w[:1].upper() + w[1:].lower()
elif len(words) == xcfg_entry_count and p_element is not None:
fields = [float(w) for w in words]
stru.addNewAtom(p_element, fields[:3])
a = stru.getLastAtom()
a.xyz *= xcfg_A
p_assign_atom(a, fields)
else:
emsg = "%d: invalid record" % p_nl
raise StructureFormatError(emsg)
if len(stru) != p_natoms:
emsg = "expected %d atoms, read %d" % (p_natoms, len(stru))
raise StructureFormatError(emsg)
except (ValueError, IndexError):
emsg = "%d: file is not in XCFG format" % p_nl
exc_type, exc_value, exc_traceback = sys.exc_info()
raise StructureFormatError, emsg, exc_traceback
return stru
def parseLines(self, lines):
"""Parse list of lines in XYZ format.
Return Structure object or raise StructureFormatError.
"""
linefields = [l.split() for l in lines]
# prepare output structure
stru = Structure()
# find first valid record
start = 0
for field in linefields:
if len(field) == 0 or field[0] == "#":
start += 1
else:
break
# first valid line gives number of atoms
try:
lfs = linefields[start]
w1 = linefields[start][0]
if len(lfs) == 1 and str(int(w1)) == w1:
p_natoms = int(w1)
#try to get lattice vectors from description line
try:
latticeVecs = map(float, linefields[start + 1])
assert len(latticeVecs) == 9
from matter.Lattice import Lattice
reshaped = [
latticeVecs[0:3], latticeVecs[3:6], latticeVecs[6:9]
]
stru.lattice = Lattice(base=reshaped)
needsDescription = True
except:
needsDescription = False
stru.description = lines[start + 1].strip()
start += 2
else:
emsg = ("%d: invalid XYZ format, missing number of atoms" %
(start + 1))
raise StructureFormatError(emsg)
except (IndexError, ValueError):
exc_type, exc_value, exc_traceback = sys.exc_info()
emsg = ("%d: invalid XYZ format, missing number of atoms" %
(start + 1))
raise StructureFormatError, emsg, exc_traceback
# find the last valid record
stop = len(lines)
while stop > start and len(linefields[stop - 1]) == 0:
stop -= 1
# get out for empty structure
if p_natoms == 0 or start >= stop:
return stru
# here we have at least one valid record line
nfields = len(linefields[start])
if nfields != 4 and nfields != 5:
emsg = "%d: invalid XYZ format, expected 4 or 5 columns" % (start +
1)
raise StructureFormatError(emsg)
# now try to read all record lines
try:
p_nl = start
for fields in linefields[start:]:
p_nl += 1
if fields == []:
continue
elif len(fields) != 4 and len(fields) != 5:
emsg = ('%d: all lines must have ' +
'a symbol, position, and optionally charge') % p_nl
raise StructureFormatError(emsg)
symbol = fields[0]
symbol = symbol[0].upper() + symbol[1:].lower()
xyz = [float(f) for f in fields[1:4]]
if len(fields) == 5:
charge = float(fields[4])
else:
charge = 0.0
stru.addNewAtom(symbol, xyz=xyz, charge=charge)
except ValueError:
exc_type, exc_value, exc_traceback = sys.exc_info()
emsg = "%d: invalid number format" % p_nl
raise StructureFormatError, emsg, exc_traceback
# finally check if all the atoms have been read
if p_natoms is not None and len(stru) != p_natoms:
emsg = "expected %d atoms, read %d" % (p_natoms, len(stru))
raise StructureFormatError(emsg)
if needsDescription:
stru.generateDescription()
return stru
def parseLines(self, lines):
"""Parse list of lines in XYZ format.
Return Structure object or raise StructureFormatError.
"""
linefields = [l.split() for l in lines]
# prepare output structure
stru = Structure()
# find first valid record
start = 0
for field in linefields:
if len(field) == 0 or field[0] == "#":
start += 1
else:
break
# first valid line gives number of atoms
try:
lfs = linefields[start]
w1 = linefields[start][0]
if len(lfs) == 1 and str(int(w1)) == w1:
p_natoms = int(w1)
stru.title = lines[start+1].strip()
start += 2
else:
emsg = ("%d: invalid XYZ format, missing number of atoms" %
(start + 1))
raise StructureFormatError(emsg)
except (IndexError, ValueError):
exc_type, exc_value, exc_traceback = sys.exc_info()
emsg = ("%d: invalid XYZ format, missing number of atoms" %
(start + 1))
raise StructureFormatError, emsg, exc_traceback
# find the last valid record
stop = len(lines)
while stop > start and len(linefields[stop-1]) == 0:
stop -= 1
# get out for empty structure
if p_natoms == 0 or start >= stop:
return stru
# here we have at least one valid record line
nfields = len(linefields[start])
if nfields != 4:
emsg = "%d: invalid XYZ format, expected 4 columns" % (start + 1)
raise StructureFormatError(emsg)
# now try to read all record lines
try:
p_nl = start
for fields in linefields[start:] :
p_nl += 1
if fields == []:
continue
elif len(fields) != nfields:
emsg = ('%d: all lines must have ' +
'the same number of columns') % p_nl
raise StructureFormatError(emsg)
symbol = fields[0]
symbol = symbol[0].upper() + symbol[1:].lower()
xyz = [ float(f) for f in fields[1:4] ]
stru.addNewAtom(symbol, xyz=xyz)
except ValueError:
exc_type, exc_value, exc_traceback = sys.exc_info()
emsg = "%d: invalid number format" % p_nl
raise StructureFormatError, emsg, exc_traceback
# finally check if all the atoms have been read
if p_natoms is not None and len(stru) != p_natoms:
emsg = "expected %d atoms, read %d" % (p_natoms, len(stru))
raise StructureFormatError(emsg)
return stru