ExprNode Parser::parse_binary_rhs_(int expr_prec, ExprNode lhs, std::string const* fn_name, Function* fn)
{
while (1)
{
auto cur_prec = operator_precedence(cur_tok_);
if (cur_prec < expr_prec)
return lhs;
auto bin_op = cur_tok_;
cur_tok_ = lex_->next();
auto rhs = parse_unary_(fn_name, fn);
auto next_op = cur_tok_;
auto next_prec = operator_precedence(next_op);
while (cur_prec < next_prec ||
(operator_associativity(next_op) == Associativity::right && cur_prec == next_prec))
{
rhs = parse_binary_rhs_(next_prec, std::move(rhs), fn_name, fn);
next_op = cur_tok_;
next_prec = operator_precedence(next_op);
}
if (bin_op == '=')
lhs = std::make_unique<AssignmentTree>(std::move(lhs), std::move(rhs));
else
lhs = std::make_unique<BinaryExprTree>(bin_op, std::move(lhs), std::move(rhs));
}
}
// Parses an expression, stopping when we reach a binary
// operator of lower precedence than the given precedence.
Operand expr_precedence(Parser *parser, Precedence precedence) {
Lexer *lexer = lexer->next;
// Expect a left hand side operand
Operand left = expr_left(parser);
// Parse a binary operator
Token operator = lexer->token;
while (operator_precedence(operator) > precedence) {
}
}
static bool execute(char *buffer, bool *data)
{
char *token, **ops, *o1, *o2;
bool *output, res;
int n_o, n_q, sz_o, sz_q;;
sz_o = 8192;
sz_q = 8192;
ops = malloc(sz_q * sizeof(char *));
output = malloc(sz_o * sizeof(bool));
n_o = n_q = 0;
for (token = strtok(buffer, " "); token; token = strtok(NULL, " ")) {
if (strncmp(token, "b", 1) == 0) {
push_bit(data[atoi(token + 1)], &output, &n_o, &sz_o);
} else if (is_function(token)) {
push_op(token, &ops, &n_q, &sz_q);
} else if (strncmp(token, ",", 1) == 0) {
while (strncmp(peek_op(ops, n_q), "(", 1) != 0) {
token = pop_op(ops, &n_q);
if (is_operator(token)) {
push_bit(operator(token, pop_bit(output, &n_o), pop_bit(output, &n_o)), &output, &n_o, &sz_o);
} else {
push_bit(function(token, output, &n_o), &output, &n_o, &sz_o);
}
}
} else if (is_operator(token)) {
o1 = token;
while (peek_op(ops, n_q) && is_operator(peek_op(ops, n_q))) {
o2 = peek_op(ops, n_q);
if (operator_precedence(o1) <= operator_precedence(o2)) {
push_bit(operator(pop_op(ops, &n_q), pop_bit(output, &n_o), pop_bit(output, &n_o)), &output, &n_o, &sz_o);
} else {
break;
}
}
push_op(o1, &ops, &n_q, &sz_q);
} else if (strncmp(token, "(", 1) == 0) {
push_op(token, &ops, &n_q, &sz_q);
} else if (strncmp(token, ")", 1) == 0) {
while (strncmp(peek_op(ops, n_q), "(", 1) != 0) {
token = pop_op(ops, &n_q);
if (is_operator(token)) {
push_bit(operator(token, pop_bit(output, &n_o), pop_bit(output, &n_o)), &output, &n_o, &sz_o);
} else {
push_bit(function(token, output, &n_o), &output, &n_o, &sz_o);
}
}
token = pop_op(ops, &n_q); /* pop the left bracket */
if (peek_op(ops, n_q) && is_function(peek_op(ops, n_q))) {
push_bit(function(pop_op(ops, &n_q), output, &n_o), &output, &n_o, &sz_o);
}
} else {
fprintf(stderr, "ERROR: unknown symbol: %s\n", token);
exit(EXIT_FAILURE);
}
}
while ((token = pop_op(ops, &n_q))) {
if (is_operator(token)) {
push_bit(operator(token, pop_bit(output, &n_o), pop_bit(output, &n_o)), &output, &n_o, &sz_o);
} else {
push_bit(function(token, output, &n_o), &output, &n_o, &sz_o);
}
}
res = output[0];
free(output);
free(ops);
return res;
}