CodeBlob iNumber(Number number) {
return iNumber(number.coefficient, number.exponent);
}
void parseNumber(const std::string& number,
Signedness signedness,
T& sign,
std::string& integer,
std::string& fractional)
{
char dec_point = '.';
enum {PS_SIGN, PS_INT, PS_POINT, PS_FRAC} state;
state = PS_SIGN;
std::string iNumber(number);
if (iNumber.empty()) {
iNumber = "0";
}
T iSign = T(1);
std::string iInteger;
std::string iFractional;
sign = T(1);
integer = "0";
fractional = "0";
std::size_t idx = 0;
if ((iNumber[idx] == '-') && (signedness == Fi::SIGNED)) {
iSign = T(-1);
++idx;
state = PS_INT;
}
else if ((iNumber[idx] == '-') && (signedness == Fi::UNSIGNED)) {
throw std::invalid_argument("An unsigned number cannot have a "
"negative sign!");
}
else if (iNumber[idx] == '+') {
iSign = T(1);
++idx;
state = PS_INT;
}
else if (isDigit(iNumber[idx])) {
iSign = T(1);
state = PS_INT;
}
else if (iNumber[idx] == dec_point) {
iSign = T(1);
++idx;
state = PS_FRAC;
}
else {
throw std::invalid_argument("Invalid number format: " + number);
}
for (; idx < iNumber.length(); ++idx) {
if (isDigit(iNumber[idx]) && (state == PS_INT)) {
iInteger.push_back(iNumber[idx]);
}
else if (isDigit(iNumber[idx]) && (state == PS_FRAC)) {
iFractional.push_back(iNumber[idx]);
}
else if ((iNumber[idx] == dec_point) && (state == PS_INT)) {
state = PS_FRAC;
}
else {
throw std::invalid_argument("Invalid number format: " + number);
}
}
if (iInteger.empty() && iFractional.empty()) {
throw std::invalid_argument("A number must have at least one digit!");
}
size_t firstNZ = iInteger.find_first_not_of('0');
if (firstNZ > 0) {
iInteger.erase(0, firstNZ);
}
size_t lastNZ = iFractional.find_last_not_of('0');
if (lastNZ == std::string::npos) {
iFractional = "0";
}
else {
iFractional.erase(lastNZ + 1);
}
if (iInteger.empty()) {
iInteger = "0";
}
if (iFractional.empty()) {
iFractional = "0";
}
sign = iSign;
integer = iInteger;
fractional = iFractional;
}
