def parse_asn_statement():
tokenizer = get_tokenizer()
tokenizer.pop_and_check(YOU)
token = tokenizer.top()
if token == MAKE:
statement = RecipeASN()
statement.parse()
return statement
elif token == CAN:
return parse_buy_statement()
raise ParseError("Invalid token at line {0}.".format(tokenizer.get_line()))
def parse_list(end_token):
results = []
tokenizer = get_tokenizer()
while tokenizer.top() != end_token:
full_identifier = parse_name([SEPARATOR, end_token])
if tokenizer.top() == SEPARATOR:
tokenizer.pop()
if full_identifier:
results.append(full_identifier)
tokenizer.pop_and_check(end_token)
return results
def parse_name(end_tokens):
full_identifier = ""
tokenizer = get_tokenizer()
while tokenizer.has_next() and tokenizer.top() not in end_tokens:
if len(full_identifier) > 0:
full_identifier += " "
full_identifier += tokenizer.pop()
if not tokenizer.has_next():
raise ParseError(
"Expected one of the following tokens {0} at line {1}.".format(
end_tokens, tokenizer.get_line()))
return full_identifier
def parse_statement():
tokenizer = get_tokenizer()
token = tokenizer.top()
if token == NEW:
return parse_dec_statement()
if token == YOU:
return parse_asn_statement()
if token == CALL:
statement = ProcCall()
statement.parse()
return statement
if token == PRINT:
statement = PrintStatement()
statement.parse()
return statement
raise ParseError("Invalid token {0} at line {1}.".format(
token, tokenizer.get_line()))
def parse_dec_statement():
tokenizer = get_tokenizer()
tokenizer.pop_and_check(NEW)
token = tokenizer.top()
statement = None
if token == INGREDIENTS:
statement = IngredientsDec()
elif token == STORES:
statement = StoresDec()
elif token == MEASUREMENTS:
statement = MeasuresDec()
elif token == RECIPES:
statement = RecipesDec()
if statement is None:
raise ParseError("Invalid token at line {0}.".format(
tokenizer.get_line()))
statement.parse()
return statement
def parse_buy_statement():
tokenizer = get_tokenizer()
tokenizer.pop_and_check(CAN)
tokenizer.pop_and_check(BUY)
list = parse_list(AT)
store_name = parse_name([END_OF_LINE, FOR])
token = tokenizer.top()
statement = None
if token == END_OF_LINE:
statement = StoreASN(list, store_name)
elif token == FOR:
statement = PartCostASN(list, store_name)
if statement is None:
raise ParseError("Invalid token at line {0}.".format(
tokenizer.get_line()))
statement.parse()
return statement
def __init__(self):
self.tokenizer = get_tokenizer()
self.output = get_output()
self.symbol_table = get_symbol_table()