Value parseAdditiveExpression(void) {
Value v1, v2;
v1 = parseMultiplicativeExpression();
while (token == TOK_PLUS || token == TOK_MINUS) {
if (token == TOK_PLUS) {
getToken();
v2 = parseMultiplicativeExpression();
if (v1.sym != NULL && v2.sym != NULL) {
error("addition of symbols not supported, line %d", lineno);
}
if (v2.sym != NULL) {
v1.sym = v2.sym;
}
v1.con += v2.con;
} else
if (token == TOK_MINUS) {
getToken();
v2 = parseMultiplicativeExpression();
if (v2.sym != NULL) {
error("subtraction of symbols not supported, line %d", lineno);
}
v1.con -= v2.con;
}
}
return v1;
}
bool Expr::parseAdditiveExpression() {
PARSER_FLOW_TRACER();
/* right associative */
FAIL_IF_NOT(parseMultiplicativeExpression());
while (IS_ADDI_EXPR_OPER(ahead().type())) {
Model::ExprBinary::Ptr result = new Model::ExprBinary;
result->setLeftOperand(model());
result->setBinaryOperator(tokenToBinary(ahead().type()));
next();
FAIL_IF_NOT(parseMultiplicativeExpression());
result->setRightOperand(model());
setModel(result);
}
return true;
}