bool Expr::parseUnaryExpression() {
PARSER_FLOW_TRACER();
/* left associative */
switch (ahead().type()) {
case T_AT_SIGN:
emitError("addr-of-operator unsupported");
// ### @foo (addr-of operator)
return false;
case T_MINUS:
case T_PLUS:
case T_NOT: {
Model::ExprUnary::Ptr result = new Model::ExprUnary;
result->setUnaryOperator(tokenToUnary(ahead().type()));
next();
FAIL_IF_NOT(parsePrimaryExpression());
result->setOperand(model());
setModel(result);
return true; }
default:
return parsePrimaryExpression();
}
}
Value parseUnaryExpression(void) {
Value v;
if (token == TOK_PLUS) {
getToken();
v = parseUnaryExpression();
} else
if (token == TOK_MINUS) {
getToken();
v = parseUnaryExpression();
if (v.sym != NULL) {
error("cannot negate symbol '%s' in line %d", v.sym->name, lineno);
}
v.con = -v.con;
} else
if (token == TOK_TILDE) {
getToken();
v = parseUnaryExpression();
if (v.sym != NULL) {
error("cannot complement symbol '%s' in line %d", v.sym->name, lineno);
}
v.con = ~v.con;
} else {
v = parsePrimaryExpression();
}
return v;
}
