def class_decl(self, args):
id = args[0].children[0]
extends = args[1]
fields = args[3]
cls = Class(id, extends)
variables = fields['variables']
functions = fields['functions']
for var in variables:
cls.addVariable(var['id'], var['type'])
for f in functions:
cls.addMethod(f['name'], f['type'])
self.structure.append({'type': 'class', 'name': id})
