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"""Read .hc files."""
# Author: Eric Larson <larson.eric.d<gmail.com>
#
# License: BSD (3-clause)
import numpy as np
from ...utils import logger
from .res4 import _make_ctf_name
from .constants import CTF
from ..constants import FIFF
_kind_dict = {'nasion': CTF.CTFV_COIL_NAS, 'left ear': CTF.CTFV_COIL_LPA,
'right ear': CTF.CTFV_COIL_RPA, 'spare': CTF.CTFV_COIL_SPARE}
_coord_dict = {'relative to dewar': FIFF.FIFFV_MNE_COORD_CTF_DEVICE,
'relative to head': FIFF.FIFFV_MNE_COORD_CTF_HEAD}
def _read_one_coil_point(fid):
"""Read coil coordinate information from the hc file."""
# Descriptor
one = '#'
while len(one) > 0 and one[0] == '#':
one = fid.readline()
if len(one) == 0:
return None
one = one.strip().decode('utf-8')
if 'Unable' in one:
raise RuntimeError("HPI information not available")
# Hopefully this is an unambiguous interpretation
p = dict()
p['valid'] = ('measured' in one)
for key, val in _coord_dict.items():
if key in one:
p['coord_frame'] = val
break
else:
p['coord_frame'] = -1
for key, val in _kind_dict.items():
if key in one:
p['kind'] = val
break
else:
p['kind'] = -1
# Three coordinates
p['r'] = np.empty(3)
for ii, coord in enumerate('xyz'):
sp = fid.readline().decode('utf-8').strip()
if len(sp) == 0: # blank line
continue
sp = sp.split(' ')
if len(sp) != 3 or sp[0] != coord or sp[1] != '=':
raise RuntimeError('Bad line: %s' % one)
# We do not deal with centimeters
p['r'][ii] = float(sp[2]) / 100.0
return p
def _read_hc(directory):
"""Read the hc file to get the HPI info and to prepare for coord trans."""
fname = _make_ctf_name(directory, 'hc', raise_error=False)
if fname is None:
logger.info(' hc data not present')
return None
s = list()
with open(fname, 'rb') as fid:
while(True):
p = _read_one_coil_point(fid)
if p is None:
# First point bad indicates that the file is empty
if len(s) == 0:
logger.info('hc file empty, no data present')
return None
# Returns None if at EOF
logger.info(' hc data read.')
return s
if p['valid']:
s.append(p)
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