def get_boolean_expression(self):
tok = self.lex.get_next_token()
if tok.get_tok_type() == TokenType.EQ_TOK:
self.match(tok, TokenType.EQ_TOK)
rel_op = RelativeOperator.EQ_OP
elif tok.get_tok_type() == TokenType.NE_TOK:
self.match(tok, TokenType.NE_TOK)
rel_op = RelativeOperator.NE_OP
elif tok.get_tok_type() == TokenType.LT_TOK:
self.match(tok, TokenType.LT_TOK)
rel_op = RelativeOperator.LT_OP
elif tok.get_tok_type() == TokenType.GT_TOK:
self.match(tok, TokenType.GT_TOK)
rel_op = RelativeOperator.GT_OP
elif tok.get_tok_type() == TokenType.LE_TOK:
self.match(tok, TokenType.LE_TOK)
rel_op = RelativeOperator.LE_OP
elif tok.get_tok_type() == TokenType.GE_TOK:
self.match(tok, TokenType.GE_TOK)
rel_op = RelativeOperator.GE_OP
else:
raise Exceptions.ParserError(Enumerated.RelativeOperator, tok)
expr1 = self.get_expression()
expr2 = self.get_expression()
return Expression.BooleanExpression(rel_op, expr1, expr2)
def Expr(self, p):
return Expression.BooleanExpression(p[0])
