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from __future__ import division # confidence high
import os
from stsci.tools import fileutil
def diff_angles(a,b):
"""
Perform angle subtraction a-b taking into account
small-angle differences across 360degree line.
"""
diff = a - b
if diff > 180.0:
diff -= 360.0
if diff < -180.0:
diff += 360.0
return diff
def getBinning(fobj, extver=1):
# Return the binning factor
binned = 1
if fobj[0].header['INSTRUME'] == 'WFPC2':
mode = fobj[0].header.get('MODE', "")
if mode == 'AREA': binned = 2
else:
binned = fobj['SCI', extver].header.get('BINAXIS',1)
return binned
def updateNEXTENDKw(fobj):
"""
Updates PRIMARY header with correct value for NEXTEND, if present.
Parameters
-----------
fobj : `astropy.io.fits.HDUList`
The FITS object for file opened in `update` mode
"""
if 'nextend' in fobj[0].header:
fobj[0].header['nextend'] = len(fobj) -1
def extract_rootname(kwvalue,suffix=""):
""" Returns the rootname from a full reference filename
If a non-valid value (any of ['','N/A','NONE','INDEF',None]) is input,
simply return a string value of 'NONE'
This function will also replace any 'suffix' specified with a blank.
"""
# check to see whether a valid kwvalue has been provided as input
if kwvalue.strip() in ['','N/A','NONE','INDEF',None]:
return 'NONE' # no valid value, so return 'NONE'
# for a valid kwvalue, parse out the rootname
# strip off any environment variable from input filename, if any are given
if '$' in kwvalue:
fullval = kwvalue[kwvalue.find('$')+1:]
else:
fullval = kwvalue
# Extract filename without path from kwvalue
fname = os.path.basename(fullval).strip()
# Now, rip out just the rootname from the full filename
rootname = fileutil.buildNewRootname(fname)
# Now, remove any known suffix from rootname
rootname = rootname.replace(suffix,'')
return rootname.strip()
def construct_distname(fobj,wcsobj):
"""
This function constructs the value for the keyword 'DISTNAME'.
It relies on the reference files specified by the keywords 'IDCTAB',
'NPOLFILE', and 'D2IMFILE'.
The final constructed value will be of the form:
<idctab rootname>-<npolfile rootname>-<d2imfile rootname>
and have a value of 'NONE' if no reference files are specified.
"""
idcname = extract_rootname(fobj[0].header.get('IDCTAB', "NONE"),
suffix='_idc')
if (idcname is None or idcname=='NONE') and wcsobj.sip is not None:
idcname = 'UNKNOWN'
npolname, npolfile = build_npolname(fobj)
if npolname is None and wcsobj.cpdis1 is not None:
npolname = 'UNKNOWN'
d2imname, d2imfile = build_d2imname(fobj)
if d2imname is None and wcsobj.det2im is not None:
d2imname = 'UNKNOWN'
sipname, idctab = build_sipname(fobj)
distname = build_distname(sipname,npolname,d2imname)
return {'DISTNAME':distname,'SIPNAME':sipname}
def build_distname(sipname,npolname,d2imname):
"""
Core function to build DISTNAME keyword value without the HSTWCS input.
"""
distname = sipname.strip()
if npolname != 'NONE' or d2imname != 'NONE':
if d2imname != 'NONE':
distname+= '-'+npolname.strip() + '-'+d2imname.strip()
else:
distname+='-'+npolname.strip()
return distname
def build_default_wcsname(idctab):
idcname = extract_rootname(idctab,suffix='_idc')
wcsname = 'IDC_' + idcname
return wcsname
def build_sipname(fobj, fname=None, sipname=None):
"""
Build a SIPNAME from IDCTAB
Parameters
----------
fobj : `astropy.io.fits.HDUList`
file object
fname : string
science file name (to be used if ROOTNAME is not present
sipname : string
user supplied SIPNAME keyword
Returns
-------
sipname, idctab
"""
try:
idctab = fobj[0].header['IDCTAB']
except KeyError:
idctab = 'N/A'
if not fname:
try:
fname = fobj.filename()
except:
fname = " "
if not sipname:
try:
sipname = fobj[0].header["SIPNAME"]
except KeyError:
try:
idcname = extract_rootname(fobj[0].header["IDCTAB"],suffix='_idc')
try:
rootname = fobj[0].header['rootname']
except KeyError:
rootname = fname
sipname = rootname +'_'+ idcname
except KeyError:
if 'A_ORDER' in fobj[1].header or 'B_ORDER' in fobj[1].header:
sipname = 'UNKNOWN'
else:
idcname = 'NOMODEL'
return sipname, idctab
def build_npolname(fobj, npolfile=None):
"""
Build a NPOLNAME from NPOLFILE
Parameters
----------
fobj : `astropy.io.fits.HDUList`
file object
npolfile : string
user supplied NPOLFILE keyword
Returns
-------
npolname, npolfile
"""
if not npolfile:
try:
npolfile = fobj[0].header["NPOLFILE"]
except KeyError:
npolfile = ' '
if fileutil.countExtn(fobj, 'WCSDVARR'):
npolname = 'UNKNOWN'
else:
npolname = 'NOMODEL'
npolname = extract_rootname(npolfile, suffix='_npl')
if npolname == 'NONE':
npolname = 'NOMODEL'
else:
npolname = extract_rootname(npolfile, suffix='_npl')
if npolname == 'NONE':
npolname = 'NOMODEL'
return npolname, npolfile
def build_d2imname(fobj, d2imfile=None):
"""
Build a D2IMNAME from D2IMFILE
Parameters
----------
fobj : `astropy.io.fits.HDUList`
file object
d2imfile : string
user supplied NPOLFILE keyword
Returns
-------
d2imname, d2imfile
"""
if not d2imfile:
try:
d2imfile = fobj[0].header["D2IMFILE"]
except KeyError:
d2imfile = 'N/A'
if fileutil.countExtn(fobj, 'D2IMARR'):
d2imname = 'UNKNOWN'
else:
d2imname = 'NOMODEL'
d2imname = extract_rootname(d2imfile,suffix='_d2i')
if d2imname == 'NONE':
d2imname = 'NOMODEL'
else:
d2imname = extract_rootname(d2imfile,suffix='_d2i')
if d2imname == 'NONE':
d2imname = 'NOMODEL'
return d2imname, d2imfile
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