def GetFrame(self, var):
if var.GetLocation() == 'GF':
return Model.GF
elif var.GetLocation() == 'LF':
return Model.LF
elif var.GetLocation() == 'TF':
if Model.TF == None:
raise Err.UndefinedFrameException("TF not defined.")
return Model.TF
else:
raise Err.UndefinedFrameException('unknown frame')
def GetValue(self, name):
""" Returns top Frame variable value.
Will throw exception, if empty, or not initialized. """
try:
return self.frames.Top().GetValue(name)
except AttributeError:
raise Err.UndefinedFrameException("Empty stackframe!")
def DefVar(self, name, c):
""" Creates new top Frame variable.
Will throw exception, if empty. """
try:
self.frames.Top().DefVar(name, c)
except AttributeError:
raise Err.UndefinedFrameException("Empty stackframe!")
def PopFrame(self):
""" Pops Frame and returns it.
Will throw exception, if empty. """
try:
return self.frames.Pop()
except IndexError:
raise Err.UndefinedFrameException("Empty stackframe!")
def Set(self, name, c):
""" Initializes top Frame variable.
Will throw exception, if does not exist. """
try:
self.frames.Top().Set(name, c)
except AttributeError:
raise Err.UndefinedFrameException("Empty stackframe!")
def Top(self):
""" Returns top item.
Will throw exception, if empty. """
try:
return self.data[-1]
except:
raise Err.UndefinedFrameException('empty framestack')
def PushFrame():
""" Pushes Frame onto LF. Aims LF operations on it.
Will throw exception, if TF is not defined. """
global TF
global LF
if TF is not None:
LF.PushFrame(TF)
TF = None
else:
raise Err.UndefinedFrameException("TF is not defined!")