// toFixed converts a number to a string, always formatting as an a decimal fraction.
// This method takes an argument specifying a number of decimal places to round the
// significand to. However when converting large values (1e+21 and above) this
// method will instead fallback to calling ToString.
EncodedJSValue JSC_HOST_CALL numberProtoFuncToFixed(ExecState* exec)
{
double x;
if (!toThisNumber(exec->thisValue(), x))
return throwVMTypeError(exec);
// Get the argument.
int decimalPlaces;
bool isUndefined; // This is ignored; undefined treated as 0.
if (!getIntegerArgumentInRange(exec, 0, 20, decimalPlaces, isUndefined))
return throwVMError(exec, createRangeError(exec, ASCIILiteral("toFixed() argument must be between 0 and 20")));
// 15.7.4.5.7 states "If x >= 10^21, then let m = ToString(x)"
// This also covers Ininity, and structure the check so that NaN
// values are also handled by numberToString
if (!(fabs(x) < 1e+21))
return JSValue::encode(jsString(exec, String::numberToStringECMAScript(x)));
// The check above will return false for NaN or Infinity, these will be
// handled by numberToString.
ASSERT(std::isfinite(x));
NumberToStringBuffer buffer;
return JSValue::encode(jsString(exec, String(numberToFixedWidthString(x, decimalPlaces, buffer))));
}
String String::numberToStringFixedWidth(double number, unsigned decimalPlaces)
{
NumberToStringBuffer buffer;
return String(numberToFixedWidthString(number, decimalPlaces, buffer));
}
