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plusSign = '\0';
break;
};
auto flags = DoubleToStringConverter::EMIT_POSITIVE_EXPONENT_SIGN |
(arg.trailingDot ? DoubleToStringConverter::EMIT_TRAILING_DECIMAL_POINT
: 0);
double val = val_;
switch (arg.presentation) {
case '%':
val *= 100;
FOLLY_FALLTHROUGH;
case 'f':
case 'F': {
if (arg.precision > DoubleToStringConverter::kMaxFixedDigitsAfterPoint) {
arg.precision = DoubleToStringConverter::kMaxFixedDigitsAfterPoint;
}
DoubleToStringConverter conv(
flags,
infinitySymbol,
nanSymbol,
exponentSymbol,
-4,
arg.precision,
0,
0);
arg.enforce(
conv.ToFixed(val, arg.precision, &builder),
"fixed double conversion failed");
break;
}
case 'e':
case 'E': {
if (arg.precision > DoubleToStringConverter::kMaxExponentialDigits) {
arg.precision = DoubleToStringConverter::kMaxExponentialDigits;
}
DoubleToStringConverter conv(
flags,
infinitySymbol,
nanSymbol,
exponentSymbol,
-4,
arg.precision,
0,
0);
arg.enforce(conv.ToExponential(val, arg.precision, &builder));
break;
}
case 'n': // should be locale-aware, but isn't
case 'g':
case 'G': {
if (arg.precision < DoubleToStringConverter::kMinPrecisionDigits) {
arg.precision = DoubleToStringConverter::kMinPrecisionDigits;
} else if (arg.precision > DoubleToStringConverter::kMaxPrecisionDigits) {
arg.precision = DoubleToStringConverter::kMaxPrecisionDigits;
}
DoubleToStringConverter conv(
flags,
infinitySymbol,
nanSymbol,
exponentSymbol,
-4,
arg.precision,
0,
0);
arg.enforce(conv.ToShortest(val, &builder));
break;
}
default:
arg.error("invalid specifier '", arg.presentation, "'");
}
auto len = builder.position();
builder.Finalize();
assert(len > 0);
// Add '+' or ' ' sign if needed
char* p = buf + 1;
// anything that's neither negative nor nan
prefixLen = 0;
if (plusSign && (*p != '-' && *p != 'n' && *p != 'N')) {
*--p = plusSign;
++len;
prefixLen = 1;
} else if (*p == '-') {
prefixLen = 1;
}
piece = fbstring(p, size_t(len));
}
void FormatArg::initSlow() {
auto b = fullArgString.begin();
auto end = fullArgString.end();
// Parse key
auto p = static_cast<const char*>(memchr(b, ':', size_t(end - b)));
if (!p) {