def expression(token):
# Expressions, Grammer: term (op term)*
print "<expression>"
token = term(token)
tmp_tkn = tokanizer.next_token_temp()
t_type_o = op_checking(tmp_tkn[0])
if t_type_o == "op":
token = tokanizer.next_token()
while t_type_o == "op":
print_token(token[0], token[1])
token = tokanizer.next_token()
token = term(token)
tmp_tkn = tokanizer.next_token_temp()
t_type_o = op_checking(tmp_tkn)
if t_type_o == "op":
token = tokanizer.next_token()
print "</expression>"
return token
def expression_list(token):
# Expression List, Grammer: (expression (',' expression)* )?
print "<expressionList>"
if token[0] != ")":
token = expression(token)
tmp_tkn = tokanizer.next_token_temp()
if tmp_tkn[0] == ",":
token = tokanizer.next_token()
while token[0] == ",":
print_token(token[0], token[1])
token = tokanizer.next_token()
token = expression(token)
token = tokanizer.next_token()
print "</expressionList>"
return token
def term(token):
# term, Grammer: integerConstant | stringConstant | keywordConstant | varName | varName '[' expression ']' | subroutineCall | '(' expression ')' | unaryOp term
print "<term>"
if token[1] == "integerConstant" or token[1] == "stringConstant":
print_token(token[0], token[1])
if token[1] == "keyword":
print_token(token[0], token[1])
if token[1] == "identifier":
tmp_token = tokanizer.next_token_temp()
if tmp_token[0] != "." and tmp_token[0] != "(" and tmp_token[0] != "[":
print_token(token[0], token[1])
if tmp_token[0] == "[":
print_token(token[0], token[1])
token = tokanizer.next_token()
if token[0] == "[":
print_token(token[0], token[1])
token = tokanizer.next_token()
token = expression(token)
token = tokanizer.next_token()
if token[0] == "]":
print_token(token[0], token[1])
if tmp_token[0] == "(" or tmp_token[0] == ".":
""" print_token(token[0], token[1])
token = tokanizer.next_token()
print_token(token[0], token[1])
token = tokanizer.next_token()"""
token = subroutine_call(token)
t_type = keyword_constant_checking(token[0])
if t_type == "keywordConstant":
print_token(token[0], token[1])
if token[0] == "(":
print_token(token[0], token[1])
token = tokanizer.next_token()
token = expression(token)
token = tokanizer.next_token()
if token[0] == ")":
print_token(token[0], token[1])
if token[0] == "~" or token[0] == "-":
print_token(token[0], "unaryOp")
token = tokanizer.next_token()
token = term(token)
print "</term>"
return token
