def checkRADec(rawRADec):
"""Check and convert a pair of equatorial coordinates.
[ rawRADec is a string ->
if rawRADec is a valid set of equatorial coordinates ->
return those coordinates as a sidereal.RADec instance
else ->
sys.stderr +:= error message
stop execution ]
"""
#-- 1 --
# [ if rawRADec contains either a '+' or a '-' ->
# m := a re.match instance describing the first matching
# character
# else ->
# sys.stderr +:= error message
# stop execution ]
m = SIGN_PAT.search(rawRADec)
if m is None:
usage("Equatorial coordinates must be separated by " "'+' or '-'.")
#-- 2 --
# [ rawRA := rawRADec up to the match described by m
# sign := characters matched by m
# rawDec := rawRADec past the match described by m ]
rawRA = rawRADec[:m.start()]
sign = m.group()
rawDec = rawRADec[m.end():]
#-- 3 --
# [ if rawRA is a valid hours expression ->
# ra := rawRA as radians
# else ->
# sys.stderr +:= error message
# stop execution ]
try:
raHours = sidereal.parseHours(rawRA)
ra = sidereal.hoursToRadians(raHours)
except SyntaxError as detail:
usage("Right ascension '%s' should have the form "
"'NNh[NNm[NN.NNNs]]'." % rawRA)
#-- 4 --
# [ if rawDec is a valid angle expression ->
# absDec := that angle in radians
# sys.stderr +:= error message
# stop execution ]
try:
absDec = sidereal.parseAngle(rawDec)
except SyntaxError as detail:
usage("Right ascension '%s' should have the form "
"'NNd[NNm[NN.NNNs]]'." % rawDec)
#-- 5 --
if sign == '-': dec = -absDec
else: dec = absDec
#-- 6 --
return sidereal.RADec(ra, dec)
def checkAltAz ( rawAltAz ):
"""Check and convert a pair of horizon py.
[ rawAltAz is a string ->
if rawAltAz is a valid set of horizon py ->
return those py as a sidereal.AltAz instance
else ->
sys.stderr +:= error message
stop execution ]
"""
#-- 1 --
# [ if rawAltAz contains either a '+' or a '-' ->
# m := a re.match instance describing the first matching
# character
# else ->
# sys.stderr +:= error message
# stop execution ]
m = SIGN_PAT.search ( rawAltAz )
if m is None:
usage ( "Equatorial py must be separated by "
"'+' or '-'." )
#-- 2 --
# [ rawAz := rawAltAz up to the match described by m
# sign := characters matched by m
# rawAlt := rawAltAz past the match described by m ]
rawAz = rawAltAz[:m.start()]
sign = m.group()
rawAlt = rawAltAz[m.end():]
#-- 3 --
# [ if rawAz is a valid angle ->
# az := that angle as radians
# else ->
# sys.stderr +:= error message
# stop execution ]
try:
az = sidereal.parseAngle ( rawAz )
except SyntaxError, detail:
usage ( "Azimuth '%s' should have the form "
"'NNNd[NNm[NN.NNNs]]'." % rawAz )
def checkAltAz(rawAltAz):
"""Check and convert a pair of horizon coordinates.
[ rawAltAz is a string ->
if rawAltAz is a valid set of horizon coordinates ->
return those coordinates as a sidereal.AltAz instance
else ->
sys.stderr +:= error message
stop execution ]
"""
#-- 1 --
# [ if rawAltAz contains either a '+' or a '-' ->
# m := a re.match instance describing the first matching
# character
# else ->
# sys.stderr +:= error message
# stop execution ]
m = SIGN_PAT.search(rawAltAz)
if m is None:
usage("Equatorial coordinates must be separated by " "'+' or '-'.")
#-- 2 --
# [ rawAz := rawAltAz up to the match described by m
# sign := characters matched by m
# rawAlt := rawAltAz past the match described by m ]
rawAz = rawAltAz[:m.start()]
sign = m.group()
rawAlt = rawAltAz[m.end():]
#-- 3 --
# [ if rawAz is a valid angle ->
# az := that angle as radians
# else ->
# sys.stderr +:= error message
# stop execution ]
try:
az = sidereal.parseAngle(rawAz)
except SyntaxError, detail:
usage("Azimuth '%s' should have the form "
"'NNNd[NNm[NN.NNNs]]'." % rawAz)
# sys.stderr +:= error message
# stop execution ]
try:
az = sidereal.parseAngle ( rawAz )
except SyntaxError, detail:
usage ( "Azimuth '%s' should have the form "
"'NNNd[NNm[NN.NNNs]]'." % rawAz )
#-- 4 --
# [ if rawAlt is a valid angle ->
# alt := that angle as radians
# else ->
# sys.stderr +:= error message
# stop execution ]
try:
absAlt = sidereal.parseAngle ( rawAlt )
except SyntaxError, detail:
usage ( "Altitude '%s' should have the form "
"'NNd[NNm[NN.NNNs]]'." % rawAlt )
#-- 5 --
if sign == '-': alt = - absAlt
else: alt = absAlt
#-- 6 --
return sidereal.AltAz ( alt, az )
#================================================================
# Epilogue
#----------------------------------------------------------------
if __name__ == "__main__":
# else ->
# sys.stderr +:= error message
# stop execution ]
try:
raHours = sidereal.parseHours ( rawRA )
ra = sidereal.hoursToRadians ( raHours )
except SyntaxError, detail:
usage ( "Right ascension '%s' should have the form "
"'NNh[NNm[NN.NNNs]]'." % rawRA )
#-- 4 --
# [ if rawDec is a valid angle expression ->
# absDec := that angle in radians
# sys.stderr +:= error message
# stop execution ]
try:
absDec = sidereal.parseAngle ( rawDec )
except SyntaxError, detail:
usage ( "Right ascension '%s' should have the form "
"'NNd[NNm[NN.NNNs]]'." % rawDec )
#-- 5 --
if sign == '-': dec = - absDec
else: dec = absDec
#-- 6 --
return sidereal.RADec ( ra, dec )
#================================================================
# Epilogue
#----------------------------------------------------------------
if __name__ == "__main__":
main()
# sys.stderr +:= error message
# stop execution ]
try:
az = sidereal.parseAngle(rawAz)
except SyntaxError, detail:
usage("Azimuth '%s' should have the form "
"'NNNd[NNm[NN.NNNs]]'." % rawAz)
#-- 4 --
# [ if rawAlt is a valid angle ->
# alt := that angle as radians
# else ->
# sys.stderr +:= error message
# stop execution ]
try:
absAlt = sidereal.parseAngle(rawAlt)
except SyntaxError, detail:
usage("Altitude '%s' should have the form "
"'NNd[NNm[NN.NNNs]]'." % rawAlt)
#-- 5 --
if sign == '-': alt = -absAlt
else: alt = absAlt
#-- 6 --
return sidereal.AltAz(alt, az)
#================================================================
# Epilogue
#----------------------------------------------------------------