def parse_dot(queue):
if len(queue) == 0:
print("ERROR: Code Not Complete: Expected a method call")
raise SystemExit
else:
value = queue[0][1]
if value == "length":
queue.pop(0)
d = Dot1()
return d
elif LexicalAnalyzer.is_id(value):
i = parse_identifier(queue)
validate(queue, "(")
exp_one = parse_exp_only_one(queue)
exp = parse_exp(queue)
validate(queue, ")")
d = Dot2(i, exp_one, exp)
return d
else:
print("ERROR: Code Not Complete: Expected a method call at line", queue[0][0])
raise SystemExit
def parse_new_object(queue):
if len(queue) == 0:
print("ERROR: Code Not Complete: Expected an Object")
raise SystemExit
else:
value = queue[0][1]
if value == "int":
queue.pop(0)
validate(queue, "[")
exp = parse_expression(queue)
throw_exception_expression(exp)
validate(queue, "]")
n = NewObject1(exp)
return n
elif LexicalAnalyzer.is_id(value):
i = parse_identifier(queue)
validate(queue, "(")
validate(queue, ")")
n = NewObject2(i)
return n
else:
print("ERROR: Code Not Complete: Expected an Object at line", queue[0][0])
raise SystemExit
def parse_identifier(queue):
if len(queue) == 0:
print("ERROR: Expected an identifier")
raise SystemExit
token = queue.pop(0)
if not LexicalAnalyzer.is_id(token[1]):
print("Not a correct identifier at line", token[0])
raise SystemExit
if token[1] == "public" or token[1] == "static" \
or token[1] == "void" or token[1] == "main" \
or token[1] == "int" or token[1] == "float" \
or token[1] == "if" or token[1] == "else" or token[1] == "while" \
or token[1] == "String" or token[1] == "char" or token[1] == "boolean" \
or token[1] == "extends" or token[1] == "return" or token[1] == "new" \
or token[1] == "this" or token[1] == "true" or token[1] == "false" or token[1] == "class":
print("Using keyword as an identifier 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
def parse_statement(queue):
if len(queue) == 0:
print("ERROR: Code Not Complete: Expected a Statement")
raise SystemExit
else:
value = queue[0][1]
if value == "{":
queue.pop(0)
st = parse_st(queue)
validate(queue, "}")
s = Statement1(st)
return s
elif value == "if":
queue.pop(0)
validate(queue, "(")
exp = parse_expression(queue)
throw_exception_expression(exp)
validate(queue, ")")
s = parse_statement(queue)
el = parse_else(queue)
s2 = Statement2(exp, s, el)
return s2
elif value == "while":
queue.pop(0)
validate(queue, "(")
exp = parse_expression(queue)
throw_exception_expression(exp)
validate(queue, ")")
s = parse_statement(queue)
s3 = Statement3(exp, s)
return s3
elif value == "System.out.println":
queue.pop(0)
validate(queue, "(")
exp = parse_expression(queue)
throw_exception_expression(exp)
validate(queue, ")")
validate(queue, ";")
s4 = Statement4(exp)
throw_exception_expression(exp)
return s4
elif LexicalAnalyzer.is_id(value):
i = parse_identifier(queue)
si = parse_single_or_array(queue)
s5 = Statement5(i, si)
return s5
else:
e = Epsilon()
return e
