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class Scope(object):
__shared_state = {}
__current_function = None
__functions = {}
def __init__(self):
self.__dict__ = self.__shared_state
def set_function(self, name):
self.__current_function = name
def new(self, name, symbols = []):
if getattr(self.__functions, name, None):
raise ScopeError("multiple definitions of %s" % name)
self.__functions[name] = ([], [])
self.set_function(name)
def add(self, symbols, i):
if type(symbols) != type([]):
symbols = [symbols]
for symbol in symbols:
if symbol not in self.__functions[self.__current_function][i]:
self.__functions[self.__current_function][i].append(symbol)
def add_params(self, symbols):
self.add(symbols, 0)
def add_locals(self, symbols):
self.add(symbols, 1)
def contains(self, name):
return name in reduce(lambda x,y: x+y, self.__functions[self.__current_function])
def get_variable_offset(self, name):
try:
return self.__functions[self.__current_function][0].index(name) + 2
except:
return -self.__functions[self.__current_function][1].index(name) - 1
def get_variables(self):
return self.__functions[self.__current_function]
def __str__(self):
return "<Scope: %s>" % str(self.__functions)
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