class VariableManager(object):
def __init__(self):
self.variables = {}
self.shadowed = {}
self.Memory = MemoryManager()
self.error = False
def __getitem__(self, var_name):
return self.variables[var_name]
def new_variable(self,
name,
_type,
line,
start_index=None,
end_index=None):
if name in self.variables.keys():
self.error = True
original_var = self.variables[name]
print(
"Error! line {}\n"
"Multiple declaration of a variable. {} already declared in {} line"
.format(line, name, original_var.lineno),
file=sys.stderr)
else:
if _type == "int":
address = self.Memory.allocate(1)
self.variables[name] = Int(lineno=line, address=address)
elif _type == "tab":
if start_index > end_index:
print("Error! line {}\n"
"Invalid range of tab {}\n".format(line, name),
file=sys.stderr)
tab_size = end_index - start_index + 1
address = self.Memory.allocate(tab_size)
self.variables[name] = Tab(lineno=line,
start_index=start_index,
end_index=end_index,
address=address)
else:
raise ValueError("No variable type ", _type)
def new_iterator(self, name, line):
if name in self.variables.keys():
self.shadowed[name] = self.variables[name]
self.variables.__delitem__(name)
# raise Warning("might be a problem")
address = self.Memory.allocate_iterator()
self.variables[name] = Int(lineno=line,
address=address,
is_iterator=True)
# is initialized too
def get_iterator_address(self, name):
iterator = self.variables[name]
if not iterator.is_iterator:
raise Exception("U ARE PICKING NOT AN ITERATOR")
return iterator.address
def delete_iterator(self, name):
iterator = self.variables[name]
if not iterator.is_iterator:
raise Exception("U ARE DELETING A VAR NOT ITER !!!")
self.Memory.deallocate_iterator(iterator.address)
self.variables.__delitem__(name)
if name in self.shadowed.keys():
self.variables[name] = self.shadowed[name]
def check_if_in_bounds(self, tab_name, index, line):
tab = self[tab_name]
if index < tab.start_index or tab.end_index < index:
self.error = True
print("Error! line {}\n"
"Index {} is out of bounds for tab '{}'\n".format(
line, index, tab_name),
file=sys.stderr)
return False
return True
