def testLoaded():
""" Tests to see whether a backend is already loaded.
Returns the name of the loaded backend, or an empty
string if nothing is loaded.
If visvis is part of a frozen app, returns "" always.
"""
if isFrozen():
return ""
else:
# see which backends we have
path = __file__
path = os.path.dirname(path)
files = os.listdir(path)
for filename in files:
if filename.startswith("__"):
continue
if not filename.endswith(".py"):
continue
be = filename[:-3]
modNameFull = "visvis.backends." + be
if sys.modules.has_key(modNameFull):
i = be.find("_")
return be[i + 1 :]
# nothing found...
return ""
def _loadBackend(name):
""" Load the backend with the specified name.
Returns True on success and False otherwise.
"""
# Get module names
modName = "backend_" + name
modNameFull = "visvis.backends.backend_" + name
modFileName = os.path.join(os.path.dirname(__file__), modName + ".py")
# Test whether to use the pyc version
load_module = imp.load_source
if not os.path.isfile(modFileName):
modFileName += "c" # Probably a frozen app
# Try importing the backend toolkit
try:
modNameTk = backendMap[name]
__import__(modNameTk)
except ImportError:
return False
# Try importing the visvis backend module
try:
if modFileName.endswith(".pyc"):
module = __import__(modNameFull, fromlist=[modName])
else:
module = imp.load_source(modNameFull, modFileName)
globals()[modName] = module
except Exception, why:
if not isFrozen():
# Only show if not frozen. If frozen, it can easily happen that
# the GUI toolkit is available, but the visvis backend is not.
print "Error importing %s backend:" % name, why
return False
def testLoaded():
""" Tests to see whether a backend is already loaded.
Returns the name of the loaded backend, or an empty
string if nothing is loaded.
If visvis is part of a frozen app, returns "" always.
"""
if isFrozen():
return ""
else:
# see which backends we have
path = __file__
path = os.path.dirname( path )
files = os.listdir(path)
for filename in files:
if not filename.startswith('backend_'):
continue
if not filename.endswith('.py'):
continue
be = filename[:-3]
modNameFull = 'visvis.backends.' + be
if modNameFull in sys.modules:
i = be.find('_')
return be[i+1:]
# nothing found...
return ''
def _loadBackend(name):
""" Load the backend with the specified name.
Returns True on success and False otherwise.
"""
# Get module names
modName = 'backend_' + name
modNameFull = 'visvis.backends.backend_' + name
modFileName = os.path.join(os.path.dirname(__file__), modName + '.py')
# Test whether to use the pyc version
load_module = imp.load_source
if not os.path.isfile(modFileName):
modFileName += "c" # Probably a frozen app
# Try importing the backend toolkit
try:
modNameTk = backendMap[name]
__import__(modNameTk)
except ImportError:
return False
# Try importing the visvis backend module
try:
if modFileName.endswith('.pyc'):
module = __import__(modNameFull, fromlist=[modName])
else:
module = imp.load_source(modNameFull, modFileName)
globals()[modName] = module
except Exception, why:
if not isFrozen():
# Only show if not frozen. If frozen, it can easily happen that
# the GUI toolkit is available, but the visvis backend is not.
print 'Error importing %s backend:' % name, why
return False
def _loadBackend(name):
""" Load the backend with the specified name.
Returns True on success and False otherwise.
"""
# Get module names
modName = 'backend_' + name
modNameFull = 'visvis.backends.backend_' + name
modFileName = os.path.join(os.path.dirname(__file__), modName + '.py')
# Test whether to use the pyc version
load_module = imp.load_source
if not os.path.isfile(modFileName):
modFileName += "c" # Probably a frozen app
# Try importing the backend toolkit
try:
modNameTk = backendMap[name]
__import__(modNameTk)
except ImportError:
return False
# Try importing the visvis backend module
try:
if modFileName.endswith('.pyc'):
module = __import__(modNameFull, fromlist=[modName])
else:
module = imp.load_source(modNameFull, modFileName)
globals()[modName] = module
except Exception:
if not isFrozen():
# Only show if not frozen. If frozen, it can easily happen that
# the GUI toolkit is available, but the visvis backend is not.
why = str(getExceptionInstance())
print('Error importing %s backend: %s' % (name, why))
return False
# Do some tests
if not hasattr(module, 'newFigure'):
raise Exception("Backend %s does not implement newFigure!" % be)
elif not hasattr(module, 'Figure'):
raise Exception("Backend %s does not implement Figure class!" % be)
else:
# All good (as far as I can tell). Update stuff if name does not match.
module.app._backend = name
if currentBackend.name != name:
currentBackend.name = name
currentBackend.newFigure = module.newFigure
currentBackend.app = module.app
return True
def _loadBackend(name):
""" Load the backend with the specified name.
Returns True on success and False otherwise.
"""
# Get module names
modName = 'backend_' + name
modNameFull = 'visvis.backends.backend_'+name
modFileName = os.path.join(os.path.dirname(__file__), modName+'.py')
# Test whether to use the pyc version
load_module = imp.load_source
if not os.path.isfile(modFileName):
modFileName += "c" # Probably a frozen app
# Try importing the backend toolkit
try:
modNameTk = backendMap[name]
__import__(modNameTk)
except ImportError:
return False
# Try importing the visvis backend module
try:
if modFileName.endswith('.pyc'):
module = __import__(modNameFull, fromlist=[modName])
else:
module = imp.load_source(modNameFull, modFileName)
globals()[modName] = module
except Exception:
if not isFrozen():
# Only show if not frozen. If frozen, it can easily happen that
# the GUI toolkit is available, but the visvis backend is not.
why = str(getExceptionInstance())
print('Error importing %s backend: %s' % (name, why))
return False
# Do some tests
if not hasattr(module,'newFigure'):
raise Exception("Backend %s does not implement newFigure!" % be)
elif not hasattr(module,'Figure'):
raise Exception("Backend %s does not implement Figure class!" % be)
else:
# All good (as far as I can tell). Update stuff if name does not match.
module.app._backend = name
if currentBackend.name != name:
currentBackend.name = name
currentBackend.newFigure = module.newFigure
currentBackend.app = module.app
return True
