def parse_integer_literal(queue):
if len(queue) == 0:
print("ERROR: Expected an integer")
raise SystemExit
token = queue.pop(0)
if not LexicalAnalyzer.is_integer_literal(token[1]):
print("ERROR: Not an integer at line", token[0])
raise SystemExit
return token[1]
def parse_expression(queue):
if len(queue) == 0:
print("ERROR: Code Not Complete: Expected an expression")
raise SystemExit
else:
value = queue[0][1]
if LexicalAnalyzer.is_integer_literal(value):
queue.pop(0)
e_rec = parse_expression_recursion_fix(queue)
e1 = Expression1(value, e_rec)
return e1
elif value == "true":
queue.pop(0)
e_rec = parse_expression_recursion_fix(queue)
e2 = Expression2(e_rec)
return e2
elif value == "false":
queue.pop(0)
e_rec = parse_expression_recursion_fix(queue)
e3 = Expression3(e_rec)
return e3
elif value == "this":
queue.pop(0)
e_rec = parse_expression_recursion_fix(queue)
e5 = Expression5(e_rec)
return e5
elif value == "new":
queue.pop(0)
n = parse_new_object(queue)
e_rec = parse_expression_recursion_fix(queue)
e6 = Expression6(n, e_rec)
return e6
elif value == "!":
queue.pop(0)
exp = parse_expression(queue)
throw_exception_expression(exp)
e_rec = parse_expression_recursion_fix(queue)
e7 = Expression7(exp, e_rec)
return e7
elif value == "(":
queue.pop(0)
exp = parse_expression(queue)
throw_exception_expression(exp)
validate(queue, ")")
e_rec = parse_expression_recursion_fix(queue)
e8 = Expression8(exp, e_rec)
return e8
elif LexicalAnalyzer.is_id(value):
i = parse_identifier(queue)
e_rec = parse_expression_recursion_fix(queue)
e4 = Expression4(i, e_rec)
return e4
else:
e = Epsilon()
return e
